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SCREEN(1)		    General Commands Manual		     SCREEN(1)

NAME
       screen -	screen manager with VT100/ANSI terminal	emulation

SYNOPSIS
       screen [	-options ] [ cmd [ args	] ]
       screen -r [[pid.]tty[.host]]
       screen -r sessionowner/[[pid.]tty[.host]]

DESCRIPTION
       Screen is a full-screen window manager that multiplexes a physical ter-
       minal between several processes (typically interactive  shells).	  Each
       virtual terminal	provides the functions of a DEC	VT100 terminal and, in
       addition, several control functions from	the ISO	6429  (ECMA  48,  ANSI
       X3.64)  and ISO 2022 standards (e.g. insert/delete line and support for
       multiple	character sets).  There	is a  scrollback  history  buffer  for
       each virtual terminal and a copy-and-paste mechanism that allows	moving
       text regions between windows.

       When screen is called, it creates a single window with a	 shell	in  it
       (or  the	 specified  command) and then gets out of your way so that you
       can use the program as you normally would.  Then, at any	time, you  can
       create new (full-screen)	windows	with other programs in them (including
       more shells), kill existing windows, view a list	of windows, turn  out-
       put  logging  on	and off, copy-and-paste	text between windows, view the
       scrollback history, switch between windows in whatever manner you wish,
       etc.  All  windows  run	their  programs	completely independent of each
       other. Programs continue	to run when their window is currently not vis-
       ible and	even when the whole screen session is detached from the	user's
       terminal.  When a program terminates, screen (per  default)  kills  the
       window  that  contained	it.  If	this window was	in the foreground, the
       display switches	to the previous	window;	if none	are left,  screen  ex-
       its.  Shells usually distinguish	between	running	as login-shell or sub-
       shell.  Screen runs them	as  sub-shells,	 unless	 told  otherwise  (See
       "shell" .screenrc command).

       Everything  you type is sent to the program running in the current win-
       dow.  The only exception	to this	is the one keystroke that is  used  to
       initiate	a command to the window	manager.  By default, each command be-
       gins with a control-a (abbreviated C-a from now on), and	is followed by
       one  other  keystroke.	The command character and all the key bindings
       can be fully customized to be anything you like,	though they are	always
       two characters in length.

       Screen  does  not  understand the prefix	"C-" to	mean control, although
       this notation is	used in	this manual for	readability.  Please  use  the
       caret  notation ("^A" instead of	"C-a") as arguments to e.g. the	escape
       command or the -e option.  Screen will also print out  control  charac-
       ters in caret notation.

       The  standard way to create a new window	is to type "C-a	c".  This cre-
       ates a new window running a shell and switches to that  window  immedi-
       ately,  regardless  of  the state of the	process	running	in the current
       window.	Similarly, you can create a new	window with a  custom  command
       in  it  by  first binding the command to	a keystroke (in	your .screenrc
       file or at the "C-a :" command line) and	then using it  just  like  the
       "C-a  c"	command.  In addition, new windows can be created by running a
       command like:

	      screen emacs prog.c

       from a shell prompt within a previously created window.	This will  not
       run  another  copy  of screen, but will instead supply the command name
       and its arguments to the	window manager (specified in the $STY environ-
       ment variable) who will use it to create	the new	window.	 The above ex-
       ample would start the emacs editor (editing prog.c) and switch  to  its
       window. - Note that you cannot transport	environment variables from the
       invoking	shell to the application (emacs	in this	case), because	it  is
       forked from the parent screen process, not from the invoking shell.

       If  "/etc/utmp"	is  writable  by screen, an appropriate	record will be
       written to this file for	each window, and removed when  the  window  is
       terminated.   This  is useful for working with "talk", "script",	"shut-
       down", "rsend", "sccs" and other	similar	programs  that	use  the  utmp
       file to determine who you are. As long as screen	is active on your ter-
       minal, the terminal's own record	is removed from	 the  utmp  file.  See
       also "C-a L".

GETTING	STARTED
       Before  you  begin to use screen	you'll need to make sure you have cor-
       rectly selected your terminal type, just	as you	would  for  any	 other
       termcap/terminfo	program.  (You can do this by using tset for example.)

       If  you're  impatient  and want to get started without doing a lot more
       reading,	you should remember this one command:  "C-a ?".	 Typing	 these
       two characters will display a list of the available screen commands and
       their bindings. Each keystroke is discussed in the section "DEFAULT KEY
       BINDINGS".  The	manual section "CUSTOMIZATION" deals with the contents
       of your .screenrc.

       If your terminal	is a "true" auto-margin	terminal (it doesn't allow the
       last position on	the screen to be updated without scrolling the screen)
       consider	using a	version	of your	terminal's termcap that	has  automatic
       margins	turned off. This will ensure an	accurate and optimal update of
       the screen in all circumstances.	Most terminals nowadays	 have  "magic"
       margins	(automatic margins plus	usable last column). This is the VT100
       style type and perfectly	suited for screen.  If all  you've  got	 is  a
       "true"  auto-margin  terminal screen will be content to use it, but up-
       dating a	character put into the last position on	the screen may not  be
       possible	until the screen scrolls or the	character is moved into	a safe
       position	in some	other way. This	delay can be shortened by using	a ter-
       minal with insert-character capability.

COMMAND-LINE OPTIONS
       Screen has the following	command-line options:

       -a   include all	capabilities (with some	minor exceptions) in each win-
	    dow's termcap, even	if screen must redraw parts of the display  in
	    order to implement a function.

       -A   Adapt  the	sizes of all windows to	the size of the	current	termi-
	    nal.  By default, screen tries to restore  its  old	 window	 sizes
	    when  attaching to resizable terminals (those with "WS" in its de-
	    scription, e.g. suncmd or some xterm).

       -c file
	    override the default configuration file from "$HOME/.screenrc"  to
	    file.

       -d|-D [pid.tty.host]
	    does  not  start screen, but detaches the elsewhere	running	screen
	    session. It	has the	same effect as typing "C-a  d"	from  screen's
	    controlling	 terminal.  -D	is  the	equivalent to the power	detach
	    key.  If no	session	can be detached, this option  is  ignored.  In
	    combination	 with  the  -r/-R  option more powerful	effects	can be
	    achieved:

       -d -r   Reattach	a session and if necessary detach it first.

       -d -R   Reattach	a session and if necessary detach or  even  create  it
	       first.

       -d -RR  Reattach	 a  session  and if necessary detach or	create it. Use
	       the first session if more than one session is available.

       -D -r   Reattach	a session. If necessary	 detach	 and  logout  remotely
	       first.

       -D -R   Attach here and now. In detail this means: If a session is run-
	       ning, then reattach. If necessary detach	 and  logout  remotely
	       first.	If  it	was not	running	create it and notify the user.
	       This is the author's favorite.

       -D -RR  Attach here and now. Whatever that means, just do it.

	    Note: It is	always a good idea to check the	status	of  your  ses-
	    sions by means of "screen -list".

       -e xy
	    specifies the command character to be x and	the character generat-
	    ing	a literal command character to y (when typed after the command
	    character).	  The default is "C-a" and `a',	which can be specified
	    as "-e^Aa".	 When creating a screen	session, this option sets  the
	    default  command character.	In a multiuser session all users added
	    will start off with	this command character.	But when attaching  to
	    an	already	 running session, this option changes only the command
	    character of the attaching user.  This option is equivalent	to ei-
	    ther the commands "defescape" or "escape" respectively.

       -f, -fn,	and -fa
	    turns  flow-control	 on, off, or "automatic	switching mode".  This
	    can	also be	defined	through	the "defflow" .screenrc	command.

       -h num
	    Specifies the history scrollback buffer to be num lines high.

       -i   will cause the interrupt key (usually C-c) to interrupt  the  dis-
	    play  immediately  when  flow-control  is  on.   See the "defflow"
	    .screenrc command for details.  The	use of this option is discour-
	    aged.

       -l and -ln
	    turns  login  mode	on  or off (for	/etc/utmp updating).  This can
	    also be defined through the	"deflogin" .screenrc command.

       -ls [match]
       -list [match]
	    does not start screen, but prints a	list of	 pid.tty.host  strings
	    identifying	 your screen sessions.	Sessions marked	`detached' can
	    be resumed with "screen -r". Those marked `attached'  are  running
	    and	 have a	controlling terminal. If the session runs in multiuser
	    mode, it is	marked `multi'.	Sessions marked	as  `unreachable'  ei-
	    ther  live on a different host or are `dead'.  An unreachable ses-
	    sion is considered dead, when its name matches either the name  of
	    the	 local	host,  or the specified	parameter, if any.  See	the -r
	    flag for a description how to construct matches.  Sessions	marked
	    as `dead' should be	thoroughly checked and removed.	 Ask your sys-
	    tem	administrator if you are not sure. Remove  sessions  with  the
	    -wipe option.

       -L   tells screen to turn on automatic output logging for the windows.

       -Logfile	file
	    By	default	logfile	name is	"screenlog.0". You can set new logfile
	    name with the "-Logfile" option.

       -m   causes screen  to  ignore  the  $STY  environment  variable.  With
	    "screen  -m"  creation  of	a  new session is enforced, regardless
	    whether screen is called from within  another  screen  session  or
	    not.  This	flag has a special meaning in connection with the `-d'
	    option:

       -d -m   Start screen in "detached" mode.	This creates a new session but
	       doesn't	attach	to  it.	 This  is  useful  for	system startup
	       scripts.

       -D -m   This also starts	screen in "detached" mode, but doesn't fork  a
	       new process. The	command	exits if the session terminates.

       -O   selects  an	optimal	output mode for	your terminal rather than true
	    VT100 emulation (only affects auto-margin terminals	without	`LP').
	    This  can  also  be	 set in	your .screenrc by specifying `OP' in a
	    "termcap" command.

       -p number_or_name|-|=|+
	    Preselect a	window.	This is	useful when you	want to	reattach to  a
	    specific  window or	you want to send a command via the "-X"	option
	    to a specific window. As with screen's select command, "-" selects
	    the	 blank	window.	 As a special case for reattach, "=" brings up
	    the	windowlist on the blank	window,	while a	"+" will create	a  new
	    window.  The  command will not be executed if the specified	window
	    could not be found.

       -q   Suppress printing of error messages. In combination	with "-ls" the
	    exit  value	 is  as	 follows: 9 indicates a	directory without ses-
	    sions. 10 indicates	a directory with running  but  not  attachable
	    sessions.  11 (or more) indicates 1	(or more) usable sessions.  In
	    combination	with "-r" the exit value is as follows:	 10  indicates
	    that  there	 is  no	session	to resume. 12 (or more)	indicates that
	    there are 2	(or more) sessions to resume and  you  should  specify
	    which one to choose.  In all other cases "-q" has no effect.

       -Q   Some  commands now can be queried from a remote session using this
	    flag, e.g. "screen -Q windows". The	commands  will	send  the  re-
	    sponse  to the stdout of the querying process. If there was	an er-
	    ror	in the command,	then the querying process  will	 exit  with  a
	    non-zero status.

	    The	commands that can be queried now are:
	     echo
	     info
	     lastmsg
	     number
	     select
	     time
	     title
	     windows

       -r [pid.tty.host]
       -r sessionowner/[pid.tty.host]
	    resumes  a detached	screen session.	 No other options (except com-
	    binations with -d/-D) may be specified, though an optional	prefix
	    of	[pid.]tty.host	may  be	needed to distinguish between multiple
	    detached screen sessions.  The second form is used to  connect  to
	    another  user's  screen session which runs in multiuser mode. This
	    indicates that screen should look for sessions in  another	user's
	    directory. This requires setuid-root.

       -R   resumes  screen  only  when	 it's unambiguous which	one to attach,
	    usually when only one screen is detached. Otherwise	 lists	avail-
	    able  sessions.   -RR attempts to resume the first detached	screen
	    session it finds.  If successful, all other	 command-line  options
	    are	 ignored.  If no detached session exists, starts a new session
	    using the specified	options, just as if -R had not been specified.
	    The	 option	 is  set  by default if	screen is run as a login-shell
	    (actually screen uses "-xRR" in that case).	 For combinations with
	    the	-d/-D option see there.

       -s program
	    sets  the  default	shell to the program specified,	instead	of the
	    value in the environment variable $SHELL (or "/bin/sh" if not  de-
	    fined).   This  can	 also be defined through the "shell" .screenrc
	    command.  See also there.

       -S sessionname
	    When creating a new	session, this option can be used to specify  a
	    meaningful	name for the session. This name	identifies the session
	    for	"screen	-list" and "screen -r" actions.	It substitutes the de-
	    fault [tty.host] suffix.

       -t name
	    sets  the  title  (a.k.a.) for the default shell or	specified pro-
	    gram.  See also the	"shelltitle" .screenrc command.

       -T term
	    Set	the $TERM environment variable using the specified term	as op-
	    posed to the default setting of screen.

       -U   Run	 screen	in UTF-8 mode. This option tells screen	that your ter-
	    minal sends	and understands	UTF-8 encoded characters. It also sets
	    the	default	encoding for new windows to `utf8'.

       -v   Print version number.

       -wipe [match]
	    does  the same as "screen -ls", but	removes	destroyed sessions in-
	    stead of marking them as `dead'.  An unreachable session  is  con-
	    sidered  dead,  when its name matches either the name of the local
	    host, or the explicitly given parameter, if	any.  See the -r  flag
	    for	a description how to construct matches.

       -x   Attach  to	a  not	detached screen	session. (Multi	display	mode).
	    Screen refuses to attach from within itself.  But  when  cascading
	    multiple screens, loops are	not detected; take care.

       -X   Send  the  specified  command to a running screen session. You may
	    use	the -S option to specify the screen session if you  have  sev-
	    eral  screen  sessions running. You	can use	the -d or -r option to
	    tell screen	to look	only for attached or detached screen sessions.
	    Note  that	this  command  doesn't work if the session is password
	    protected.

       -4   Resolve hostnames only to IPv4 addresses.

       -6   Resolve hostnames only to IPv6 addresses.

DEFAULT	KEY BINDINGS
       As mentioned, each screen command consists of a "C-a" followed  by  one
       other  character.  For your convenience,	all commands that are bound to
       lower-case letters are also bound to their control  character  counter-
       parts (with the exception of "C-a a"; see below), thus, "C-a c" as well
       as "C-a C-c" can	be used	to create a window.  See  section  "CUSTOMIZA-
       TION" for a description of the command.

       The following table shows the default key bindings. The trailing	commas
       in boxes	with multiple keystroke	entries	are separators,	 not  part  of
       the bindings.

       ---------------------------------------------------------
       C-a '		  (select)	    Prompt for a window
					    name or  number  to
					    switch to.
       ---------------------------------------------------------
       C-a "		  (windowlist -b)   Present  a	list of
					    all	windows	for se-
					    lection.
       ---------------------------------------------------------
       C-a digit	  (select 0-9)	    Switch   to	 window
					    number 0 - 9
       ---------------------------------------------------------
       C-a -		  (select -)	    Switch  to	 window
					    number 0 - 9, or to
					    the	blank window.
       ---------------------------------------------------------
       C-a tab		  (focus)	    Switch  the	  input
					    focus  to  the next
					    region.   See  also
					    split,	remove,
					    only.
       ---------------------------------------------------------
       C-a C-a		  (other)	    Toggle to the  win-
					    dow	 displayed pre-
					    viously.  Note that
					    this   binding  de-
					    faults to the  com-
					    mand      character
					    typed twice, unless
					    overridden.	    For
					    instance,  if   you
					    use	   the	 option
					    "-e]x",  this  com-
					    mand becomes "]]".
       ---------------------------------------------------------
       C-a a		  (meta)	    Send   the	command
					    character (C-a)  to
					    window.  See escape
					    command.
       ---------------------------------------------------------
       C-a A		  (title)	    Allow the  user  to
					    enter  a  name  for
					    the	current	window.
       ---------------------------------------------------------
       C-a b,		  (break)	    Send  a  break   to
       C-a C-b				    window.
       ---------------------------------------------------------
       C-a B		  (pow_break)	    Reopen the terminal
					    line  and  send   a
					    break.
       ---------------------------------------------------------
       C-a c,		  (screen)	    Create a new window
       C-a C-c				    with  a  shell  and
					    switch to that win-
					    dow.
       ---------------------------------------------------------
       C-a C		  (clear)	    Clear the screen.
       ---------------------------------------------------------

       C-a d,		  (detach)	    Detach screen  from
       C-a C-d				    this terminal.
       ---------------------------------------------------------
       C-a D D		  (pow_detach)	    Detach and logout.
       ---------------------------------------------------------
       C-a f,		  (flow)	    Toggle flow	on, off
       C-a C-f				    or auto.
       ---------------------------------------------------------
       C-a F		  (fit)		    Resize  the	 window
					    to	the current re-
					    gion size.
       ---------------------------------------------------------
       C-a C-g		  (vbell)	    Toggles    screen's
					    visual bell	mode.
       ---------------------------------------------------------
       C-a h		  (hardcopy)	    Write a hardcopy of
					    the	current	 window
					    to	the file "hard-
					    copy.n".
       ---------------------------------------------------------
       C-a H		  (log)		    Begins/ends	logging
					    of the current win-
					    dow	 to  the   file
					    "screenlog.n".
       ---------------------------------------------------------
       C-a i,		  (info)	    Show   info	  about
       C-a C-i				    this window.
       ---------------------------------------------------------
       C-a k,		  (kill)	    Destroy	current
       C-a C-k				    window.
       ---------------------------------------------------------
       C-a l,		  (redisplay)	    Fully  refresh cur-
       C-a C-l				    rent window.
       ---------------------------------------------------------
       C-a L		  (login)	    Toggle this	windows
					    login  slot. Avail-
					    able only if screen
					    is	 configured  to
					    update   the   utmp
					    database.
       ---------------------------------------------------------
       C-a m,		  (lastmsg)	    Repeat   the   last
       C-a C-m				    message   displayed
					    in	  the	message
					    line.
       ---------------------------------------------------------
       C-a M		  (monitor)	    Toggles  monitoring
					    of the current win-
					    dow.
       ---------------------------------------------------------
       C-a space,	  (next)	    Switch to the  next
       C-a n,				    window.
       C-a C-n
       ---------------------------------------------------------
       C-a N		  (number)	    Show   the	 number
					    (and title)	of  the
					    current window.
       ---------------------------------------------------------
       C-a backspace,	  (prev)	    Switch  to the pre-
       C-a C-h,				    vious window (oppo-
       C-a p,				    site of C-a	n).
       C-a C-p
       ---------------------------------------------------------
       C-a q,		  (xon)		    Send a control-q to
       C-a C-q				    the	current	window.
       ---------------------------------------------------------

       C-a Q		  (only)	    Delete all	regions
					    but	  the	current
					    one.    See	   also
					    split,  remove, fo-
					    cus.
       ---------------------------------------------------------
       C-a r,		  (wrap)	    Toggle the	current
       C-a C-r				    window's  line-wrap
					    setting  (turn  the
					    current    window's
					    automatic	margins
					    on and off).
       ---------------------------------------------------------
       C-a s,		  (xoff)	    Send a control-s to
       C-a C-s;				    the	current	window.
       ---------------------------------------------------------
       C-a S		  (split)	    Split  the	current
					    region horizontally
					    into two new  ones.
					    See	 also only, re-
					    move, focus.
       ---------------------------------------------------------
       C-a t,		  (time)	    Show system	 infor-
       C-a C-t				    mation.
       ---------------------------------------------------------
       C-a v		  (version)	    Display the	version
					    and	    compilation
					    date.
       ---------------------------------------------------------
       C-a C-v		  (digraph)	    Enter digraph.
       C-a w,		  (windows)	    Show a list	of win-
       C-a C-w				    dow.
       ---------------------------------------------------------
       C-a W		  (width)	    Toggle 80/132  col-
					    umns.
       ---------------------------------------------------------
       C-a x or	C-a C-x	  (lockscreen)	    Lock this terminal.
       ---------------------------------------------------------
       C-a X		  (remove)	    Kill   the	current
					    region.   See  also
					    split, only, focus.
       ---------------------------------------------------------
       C-a z,		  (suspend)	    Suspend	screen.
       C-a C-z				    Your  system   must
					    support   BSD-style
					    job-control.
       ---------------------------------------------------------
       C-a Z		  (reset)	    Reset  the	virtual
					    terminal   to   its
					    "power-on" values.
       ---------------------------------------------------------
       C-a .		  (dumptermcap)	    Write out a	".term-
					    cap" file.
       ---------------------------------------------------------
       C-a ?		  (help)	    Show key bindings.
       ---------------------------------------------------------
       C-a \		  (quit)	    Kill   all	windows
					    and	      terminate
					    screen.
       ---------------------------------------------------------
       C-a :		  (colon)	    Enter  command line
					    mode.
       ---------------------------------------------------------

       C-a [,		  (copy)	    Enter  copy/scroll-
       C-a C-[,				    back mode.
       C-a esc
       ---------------------------------------------------------
       C-a C-],		  (paste .)	    Write  the contents
       C-a ]				    of the paste buffer
					    to	the stdin queue
					    of the current win-
					    dow.
       ---------------------------------------------------------
       C-a {,		  (history)	    Copy  and  paste  a
       C-a }				    previous  (command)
					    line.
       ---------------------------------------------------------
       C-a >		  (writebuf)	    Write  paste buffer
					    to a file.
       ---------------------------------------------------------
       C-a <		  (readbuf)	    Reads  the	screen-
					    exchange  file into
					    the	paste buffer.
       ---------------------------------------------------------
       C-a =		  (removebuf)	    Removes  the   file
					    used  by  C-a < and
					    C-a	>.
       ---------------------------------------------------------
       C-a ,		  (license)	    Shows where	 screen
					    comes  from,  where
					    it went to and  why
					    you	can use	it.
       ---------------------------------------------------------
       C-a _		  (silence)	    Start/stop monitor-
					    ing	  the	current
					    window for inactiv-
					    ity.
       ---------------------------------------------------------
       C-a |		  (split -v)	    Split  the	current
					    region   vertically
					    into two new ones.
       ---------------------------------------------------------
       C-a *		  (displays)	    Show a  listing  of
					    all	 currently  at-
					    tached displays.
       ---------------------------------------------------------

CUSTOMIZATION
       The "socket directory" defaults either to $HOME/.screen	or  simply  to
       /tmp/screens  or	 preferably  to	 /usr/local/screens chosen at compile-
       time. If	screen is installed setuid-root, then the administrator	should
       compile	screen with an adequate	(not NFS mounted) socket directory. If
       screen is not running setuid-root, the user can specify	any  mode  700
       directory in the	environment variable $SCREENDIR.

       When  screen  is	 invoked, it executes initialization commands from the
       files "/usr/local/etc/screenrc" and ".screenrc" in the user's home  di-
       rectory.	 These	are the	"programmer's defaults"	that can be overridden
       in the following	ways: for the global screenrc file screen searches for
       the  environment	 variable  $SYSSCREENRC	 (this override	feature	may be
       disabled	at compile-time). The user specific screenrc file is  searched
       in  $SCREENRC,  then $HOME/.screenrc.  The command line option -c takes
       precedence over the above user screenrc files.

       Commands	in these files are used	to  set	 options,  bind	 functions  to
       keys,  and to automatically establish one or more windows at the	begin-
       ning of your screen session.  Commands are listed one  per  line,  with
       empty lines being ignored.  A command's arguments are separated by tabs
       or spaces, and may be surrounded	by single or  double  quotes.	A  `#'
       turns  the rest of the line into	a comment, except in quotes.  Unintel-
       ligible lines are warned	about and ignored.  Commands may contain  ref-
       erences	to environment variables. The syntax is	the shell-like "$VAR "
       or "${VAR}". Note that this causes incompatibility with previous	screen
       versions,  as  now the '$'-character has	to be protected	with '\' if no
       variable	substitution shall be performed. A string in single-quotes  is
       also protected from variable substitution.

       Two  configuration  files are shipped as	examples with your screen dis-
       tribution: "etc/screenrc" and "etc/etcscreenrc".	They contain a	number
       of useful examples for various commands.

       Customization  can  also	 be  done 'on-line'. To	enter the command mode
       type `C-a :'. Note that commands	starting  with	"def"  change  default
       values, while others change current settings.

       The following commands are available:

       acladd usernames	[crypted-pw]

       addacl usernames

       Enable  users to	fully access this screen session. Usernames can	be one
       user or a comma separated list of users.	This command enables to	attach
       to  the screen session and performs the equivalent of `aclchg usernames
       +rwx "#?"'.  executed. To add a user with restricted  access,  use  the
       `aclchg'	 command  below.  If an	optional second	parameter is supplied,
       it should be a crypted password for the named user(s).  `Addacl'	 is  a
       synonym to `acladd'.  Multi user	mode only.

       aclchg usernames	permbits list

       chacl usernames permbits	list

       Change permissions for a	comma separated	list of	users. Permission bits
       are represented as `r', `w' and `x'. Prefixing `+' grants  the  permis-
       sion,  `-' removes it. The third	parameter is a comma separated list of
       commands	and/or windows (specified either by number or title). The spe-
       cial  list `#' refers to	all windows, `?' to all	commands. if usernames
       consists	of a single `*', all known users are affected.

       A command can be	executed when the user has the `x' bit	for  it.   The
       user  can  type	input  to  a window when he has	its `w'	bit set	and no
       other user obtains a writelock for this window.	Other  bits  are  cur-
       rently  ignored.	 To withdraw the writelock from	another	user in	window
       2: `aclchg username -w+w	2'.  To	allow read-only	access to the session:
       `aclchg	username  -w "#"'. As soon as a	user's name is known to	screen
       he can attach to	the session and	(per default) has full permissions for
       all  command  and  windows.  Execution permission for the acl commands,
       `at' and	others should also be removed or the user may be able  to  re-
       gain write permission.  Rights of the special username nobody cannot be
       changed (see the	"su" command).	`Chacl'	 is  a	synonym	 to  `aclchg'.
       Multi user mode only.

       acldel username

       Remove a	user from screen's access control list.	If currently attached,
       all the user's displays are detached from the session. He cannot	attach
       again.  Multi user mode only.

       aclgrp username [groupname]

       Creates	groups	of  users that share common access rights. The name of
       the group is the	username of the	group leader. Each member of the group
       inherits	 the  permissions  that	 are granted to	the group leader. That
       means, if a user	fails an access	check, another check is	made  for  the
       group  leader.	A  user	 is  removed from all groups the special value
       "none" is used for groupname.  If the second parameter is  omitted  all
       groups the user is in are listed.

       aclumask	[[ users ] +bits | [ users ] -bits... ]

       umask [[	users ]	+bits |	[ users	] -bits... ]

       This specifies the access other users have to windows that will be cre-
       ated by the caller of the command.  Users may be	no,  one  or  a	 comma
       separated list of known usernames. If no	users are specified, a list of
       all currently known users is assumed.  Bits is any combination  of  ac-
       cess  control  bits allowed defined with	the "aclchg" command. The spe-
       cial username "?" predefines the	access that not	yet known  users  will
       be  granted  to any window initially.  The special username "??"	prede-
       fines the access	that not yet known users are granted to	 any  command.
       Rights  of  the special username	nobody cannot be changed (see the "su"
       command).  `Umask' is a synonym to `aclumask'.

       activity	message

       When any	activity occurs	in a background	window	that  is  being	 moni-
       tored, screen displays a	notification in	the message line.  The notifi-
       cation message can be re-defined	by means of  the  "activity"  command.
       Each occurrence of `%' in message is replaced by	the number of the win-
       dow in which activity has occurred, and each occurrence of `^G' is  re-
       placed  by  the definition for bell in your termcap (usually an audible
       bell).  The default message is

		       'Activity in window %n'

       Note that monitoring is off for all windows by default, but can be  al-
       tered by	use of the "monitor" command (C-a M).

       allpartial on|off

       If  set	to  on,	 only  the  current cursor line	is refreshed on	window
       change.	This affects all windows  and  is  useful  for	slow  terminal
       lines.  The previous setting of full/partial refresh for	each window is
       restored	with "allpartial off".	This is	a global flag that immediately
       takes  effect on	all windows overriding the "partial" settings. It does
       not change the default redraw behavior of newly created windows.

       altscreen on|off

       If set to on, "alternate	screen"	support	is enabled in  virtual	termi-
       nals, just like in xterm.  Initial setting is `off'.

       at [identifier][#|*|%] command [args ...	]

       Execute	a  command  at other displays or windows as if it had been en-
       tered there.  "At" changes the context (the `current window'  or	 `cur-
       rent display' setting) of the command. If the first parameter describes
       a non-unique context, the command will be executed multiple  times.  If
       the  first  parameter  is  of the form `identifier*' then identifier is
       matched against user names.  The	command	is executed once for each dis-
       play  of	 the  selected	user(s). If the	first parameter	is of the form
       `identifier%' identifier	is  matched  against  displays.	 Displays  are
       named  after the	ttys they attach. The prefix `/dev/' or	`/dev/tty' may
       be omitted from the identifier.	If identifier has a `#'	or nothing ap-
       pended  it  is  matched	against	window numbers and titles. Omitting an
       identifier in front of the `#', `*' or `%'-character selects all	users,
       displays	 or  windows because a prefix-match is performed. Note that on
       the affected display(s) a short message will  describe  what  happened.
       Permission  is  checked	for initiator of the "at" command, not for the
       owners of the affected display(s).  Note	that the '#'  character	 works
       as  a comment introducer	when it	is preceded by whitespace. This	can be
       escaped by prefixing a '\'.  Permission is checked for the initiator of
       the "at"	command, not for the owners of the affected display(s).

       Caveat: When matching against windows, the command is executed at least
       once per	window.	Commands that change the internal arrangement of  win-
       dows  (like "other") may	be called again. In shared windows the command
       will be repeated	for each attached display. Beware, when	issuing	toggle
       commands	 like  "login"!	 Some commands (e.g. "process")	require	that a
       display is associated with the target windows.  These commands may  not
       work correctly under "at" looping over windows.

       attrcolor attrib	[attribute/color-modifier]

       This  command can be used to highlight attributes by changing the color
       of the text. If the attribute attrib is in use,	the  specified	attri-
       bute/color  modifier is also applied. If	no modifier is given, the cur-
       rent one	is deleted. See	the "STRING ESCAPES" chapter for the syntax of
       the  modifier. Screen understands two pseudo-attributes,	"i" stands for
       high-intensity foreground color and "I" for  high-intensity  background
       color.

       Examples:

	      attrcolor	b "R"

       Change the color	to bright red if bold text is to be printed.

	      attrcolor	u "-u b"

       Use blue	text instead of	underline.

	      attrcolor	b ".I"

       Use  bright  colors  for	bold text. Most	terminal emulators do this al-
       ready.

	      attrcolor	i "+b"

       Make bright colored text	also bold.

       autodetach on|off

       Sets whether screen will	automatically detach upon hangup, which	 saves
       all  your running programs until	they are resumed with a	screen -r com-
       mand.  When turned off, a hangup	signal will terminate screen  and  all
       the processes it	contains. Autodetach is	on by default.

       autonuke	on|off

       Sets  whether  a	 clear screen sequence should nuke all the output that
       has not been written to the terminal. See also "obuflimit".

       backtick	id lifespan autorefresh	cmd args...

       backtick	id

       Program the backtick command with the numerical id id.  The  output  of
       such  a command is used for substitution	of the "%`" string escape. The
       specified lifespan is the number	of seconds the	output	is  considered
       valid.  After  this  time,  the command is run again if a corresponding
       string escape is	encountered.  The autorefresh  parameter  triggers  an
       automatic  refresh  for caption and hardstatus strings after the	speci-
       fied number of seconds. Only the	last line of output is used  for  sub-
       stitution.

       If both the lifespan and	the autorefresh	parameters are zero, the back-
       tick program is expected	to stay	in the background and generate	output
       once  in	a while.  In this case,	the command is executed	right away and
       screen stores the last line of output.  If  a  new  line	 gets  printed
       screen will automatically refresh the hardstatus	or the captions.

       The  second  form  of the command deletes the backtick command with the
       numerical id id.

       bce [on|off]

       Change background-color-erase setting. If "bce" is set to on, all char-
       acters  cleared	by an erase/insert/scroll/clear	operation will be dis-
       played in the current background	color.	Otherwise  the	default	 back-
       ground color is used.

       bell_msg	[message]

       When a bell character is	sent to	a background window, screen displays a
       notification in the message line.  The notification message can be  re-
       defined by this command.	 Each occurrence of `%'	in message is replaced
       by the number of	the window to which a bell has been sent, and each oc-
       currence	of `^G'	is replaced by the definition for bell in your termcap
       (usually	an audible bell).  The default message is

			      'Bell in window %n'

       An empty	message	can be supplied	to the "bell_msg" command to  suppress
       output of a message line	(bell_msg "").	Without	parameter, the current
       message is shown.

       bind [class] key	[command [args]]

       Bind a command to a key.	 By default, most of the commands provided  by
       screen  are  bound to one or more keys as indicated in the "DEFAULT KEY
       BINDINGS" section, e.g. the command to create a new window is bound  to
       "C-c"  and  "c".	  The  "bind"  command can be used to redefine the key
       bindings	and to define new bindings.  The key argument is either	a sin-
       gle  character,	a two-character	sequence of the	form "^x" (meaning "C-
       x"), a backslash	followed by an octal number (specifying	the ASCII code
       of  the character), or a	backslash followed by a	second character, such
       as "\^" or "\\".	 The argument can also be quoted, if you like.	If  no
       further	argument is given, any previously established binding for this
       key is removed.	The command argument can be any	command	listed in this
       section.

       If  a  command class is specified via the "-c" option, the key is bound
       for the specified class.	Use the	"command" command to activate a	class.
       Command	classes	 can be	used to	create multiple	command	keys or	multi-
       character bindings.

       Some examples:

		       bind ' '	windows
		       bind ^k
		       bind k
		       bind K kill
		       bind ^f screen telnet foobar
		       bind \033 screen	-ln -t root -h 1000 9 su

       would bind the space key	to the command that displays a list of windows
       (so  that the command usually invoked by	"C-a C-w" would	also be	avail-
       able as "C-a space"). The next three  lines  remove  the	 default  kill
       binding	from "C-a C-k" and "C-a	k".  "C-a K" is	then bound to the kill
       command.	Then it	binds "C-f" to the command "create  a  window  with  a
       TELNET  connection  to  foobar",	 and bind "escape" to the command that
       creates an non-login window with	a.k.a. "root" in slot #9, with a supe-
       ruser shell and a scrollback buffer of 1000 lines.

		       bind -c demo1 0 select 10
		       bind -c demo1 1 select 11
		       bind -c demo1 2 select 12
		       bindkey "^B" command -c demo1

       makes "C-b 0" select window 10, "C-b 1" window 11, etc.

		       bind -c demo2 0 select 10
		       bind -c demo2 1 select 11
		       bind -c demo2 2 select 12
		       bind - command -c demo2

       makes "C-a - 0" select window 10, "C-a -	1" window 11, etc.

       bindkey [-d] [-m] [-a] [[-k|-t] string [cmd-args]]

       This  command manages screen's input translation	tables.	Every entry in
       one of the tables tells screen how to react if a	 certain  sequence  of
       characters is encountered. There	are three tables: one that should con-
       tain actions programmed by the user, one	for the	default	 actions  used
       for  terminal  emulation	 and  one  for screen's	copy mode to do	cursor
       movement. See section "INPUT TRANSLATION" for a	list  of  default  key
       bindings.

       If  the	-d  option  is	given,	bindkey	modifies the default table, -m
       changes the copy	mode table and with neither option the user  table  is
       selected.   The	argument string	is the sequence	of characters to which
       an action is bound. This	can either be a	fixed string or	a termcap key-
       board capability	name (selectable with the -k option).

       Some  keys  on a	VT100 terminal can send	a different string if applica-
       tion mode is turned on (e.g the cursor keys).  Such keys	have  two  en-
       tries in	the translation	table. You can select the application mode en-
       try by specifying the -a	option.

       The -t option tells screen not to do inter-character timing. One	cannot
       turn off	the timing if a	termcap	capability is used.

       Cmd  can	 be any	of screen's commands with an arbitrary number of args.
       If cmd is omitted the key-binding is removed from the table.

       Here are	some examples of keyboard bindings:

	       bindkey -d

       Show all	of the default key bindings. The application mode entries  are
       marked with [A].

	       bindkey -k k1 select 1

       Make the	"F1" key switch	to window one.

	       bindkey -t foo stuff barfoo

       Make "foo" an abbreviation of the word "barfoo".	Timeout	is disabled so
       that users can type slowly.

	       bindkey "\024" mapdefault

       This key-binding	makes "^T" an escape character	for  key-bindings.  If
       you  did	the above "stuff barfoo" binding, you can enter	the word "foo"
       by typing "^Tfoo". If you want to insert	a "^T" you have	to  press  the
       key twice (i.e.,	escape the escape binding).

	       bindkey -k F1 command

       Make the	F11 (not F1!) key an alternative screen	escape (besides	^A).

       break[duration]

       Send a break signal for duration*0.25 seconds to	this window.  For non-
       Posix systems the time interval may be  rounded	up  to	full  seconds.
       Most useful if a	character device is attached to	the window rather than
       a shell process (See also chapter "WINDOW TYPES"). The maximum duration
       of a break signal is limited to 15 seconds.

       blanker

       Activate	the screen blanker. First the screen is	cleared. If no blanker
       program is defined, the cursor is turned	off, otherwise,	the program is
       started	and  it's output is written to the screen.  The	screen blanker
       is killed with the first	keypress, the read key is discarded.

       This command is normally	used together with the "idle" command.

       blankerprg [program-args]

       Defines a blanker program. Disables the blanker program if an empty ar-
       gument  is  given.  Shows the currently set blanker program if no argu-
       ments are given.

       breaktype [tcsendbreak|TIOCSBRK|TCSBRK]

       Choose one of the available methods of generating a  break  signal  for
       terminal	 devices.  This	command	should affect the current window only.
       But it still behaves identical to "defbreaktype". This will be  changed
       in  the	future.	  Calling  "breaktype"	with no	parameter displays the
       break method for	the current window.

       bufferfile [exchange-file]

       Change the filename used	for reading and	writing	with the paste buffer.
       If  the	optional  argument to the "bufferfile" command is omitted, the
       default setting ("/tmp/screen-exchange")	is reactivated.	 The following
       example	will  paste  the system's password file	into the screen	window
       (using the paste	buffer,	where a	copy remains):

		       C-a : bufferfile	/etc/passwd
		       C-a < C-a ]
		       C-a : bufferfile

       bumpleft

       Swaps window with previous one on window	list.

       bumpright

       Swaps window with next one on window list.

       c1 [on|off]

       Change c1 code processing. "C1 on" tells	 screen	 to  treat  the	 input
       characters  between  128	 and  159 as control functions.	 Such an 8-bit
       code is normally	the same as ESC	followed by  the  corresponding	 7-bit
       code.  The  default  setting  is	to process c1 codes and	can be changed
       with the	"defc1"	command.  Users	with fonts that	have usable characters
       in the c1 positions may want to turn this off.

       caption [ top | bottom ]	always|splitonly[string]

       caption string [string]

       This  command  controls	the display of the window captions. Normally a
       caption is only used if more than one window is shown  on  the  display
       (split  screen  mode).  But if the type is set to always	screen shows a
       caption even if only one	window is displayed. The default is splitonly.

       The second form changes the text	used for the caption. You can use  all
       escapes	from  the  "STRING  ESCAPES" chapter. Screen uses a default of
       `%3n %t'.

       You can mix both	forms by providing a string as an additional argument.

       You can have the	caption	displayed either at the	top or bottom  of  the
       window.	The default is bottom.

       charset set

       Change  the current character set slot designation and charset mapping.
       The first four character	of set	are  treated  as  charset  designators
       while the fifth and sixth character must	be in range '0'	to '3' and set
       the GL/GR charset mapping. On every position a '.' may be used to indi-
       cate  that the corresponding charset/mapping should not be changed (set
       is padded to six	characters internally by appending  '.'	  chars).  New
       windows	have  "BBBB02" as default charset, unless a "encoding" command
       is active.
       The current setting can be viewed with the "info" command.

       chdir [directory]

       Change the current directory of screen to the specified	directory  or,
       if called without an argument, to your home directory (the value	of the
       environment variable $HOME).  All windows that are created by means  of
       the  "screen"  command  from  within  ".screenrc" or by means of	"C-a :
       screen ..." or "C-a c" use this as their	default	directory.  Without  a
       chdir  command,	this  would be the directory from which	screen was in-
       voked.

       Hardcopy	and log	files are always written to the	window's  default  di-
       rectory,	 not  the current directory of the process running in the win-
       dow.  You can use this command multiple	times  in  your	 .screenrc  to
       start  various  windows	in different default directories, but the last
       chdir value will	affect all the windows you create interactively.

       cjkwidth	[ on | off ]

       Treat ambiguous width characters	as full/half width.

       clear

       Clears the current window and saves its image to	the scrollback buffer.

       collapse

       Reorders	window on window list, removing	number gaps between them.

       colon [prefix]

       Allows you to enter ".screenrc" command lines.  Useful  for  on-the-fly
       modification  of	 key  bindings,	 specific window creation and changing
       settings. Note that the "set" keyword no	longer	exists!	 Usually  com-
       mands affect the	current	window rather than default settings for	future
       windows.	Change defaults	with commands starting with 'def...'.

       If you consider this as the `Ex command mode' of	screen,	you may	regard
       "C-a esc" (copy mode) as	its `Vi	command	mode'.

       command [-c class]

       This  command has the same effect as typing the screen escape character
       (^A). It	is probably only useful	for key	bindings.  If the "-c"	option
       is  given,  select  the	specified  command class.  See also "bind" and
       "bindkey".

       compacthist [on|off]

       This tells  screen  whether  to	suppress  trailing  blank  lines  when
       scrolling up text into the history buffer.

       console [on|off]

       Grabs  or un-grabs the machines console output to a window.  Note: Only
       the owner of /dev/console can grab the console output.  This command is
       only available if the machine supports the ioctl	TIOCCONS.

       copy

       Enter  copy/scrollback mode. This allows	you to copy text from the cur-
       rent window and its history into	the paste buffer. In this mode	a  vi-
       like `full screen editor' is active:
       The editor's movement keys are:

       ----------------------------------------------------------------
       h, C-h,	      move the cursor left.
       left arrow
       ----------------------------------------------------------------
       j, C-n,	      move the cursor down.
       down arrow
       ----------------------------------------------------------------
       k, C-p,	      move the cursor up.
       up arrow
       ----------------------------------------------------------------
       l ('el'),      move the cursor right.
       right arrow
       ----------------------------------------------------------------
       0 (zero)	C-a   move to the leftmost column.
       ----------------------------------------------------------------
       + and -	      positions	one line up and	down.
       ----------------------------------------------------------------
       H, M and	L     move  the	 cursor	 to the	leftmost column	of the
		      top, center or bottom line of the	window.
       ----------------------------------------------------------------
       |	      moves to the specified absolute column.
       ----------------------------------------------------------------
       g or home      moves to the beginning of	the buffer.
       ----------------------------------------------------------------
       G or end	      moves to the specified absolute  line  (default:
		      end of buffer).
       ----------------------------------------------------------------
       %	      jumps to the specified percentage	of the buffer.
       ----------------------------------------------------------------
       ^ or $	      move  to	the  leftmost  column, to the first or
		      last non-whitespace character on the line.
       ----------------------------------------------------------------
       w, b, and e    move the cursor word by word.
       ----------------------------------------------------------------
       B, E	      move the cursor WORD by WORD (as in vi).
       ----------------------------------------------------------------
       f/F, t/T	      move the cursor forward/backward to the next oc-
		      curence  of the target. (eg, '3fy' will move the
		      cursor to	the 3rd	'y' to the right.)
       ----------------------------------------------------------------
       ; and ,	      Repeat the last f/F/t/T command in the  same/op-
		      posite direction.
       ----------------------------------------------------------------

       C-e and C-y    scroll  the  display  up/down  by	one line while
		      preserving the cursor position.
       ----------------------------------------------------------------
       C-u and C-d    scroll the  display  up/down  by	the  specified
		      amount  of lines while preserving	the cursor po-
		      sition. (Default:	half screen-full).
       ----------------------------------------------------------------
       C-b and C-f    scroll the display up/down a full	screen.
       ----------------------------------------------------------------

       Note: Emacs style movement keys can be customized by a  .screenrc  com-
       mand.  (E.g. markkeys "h=^B:l=^F:$=^E") There is	no simple method for a
       full emacs-style	keymap,	as this	involves multi-character codes.

       Some keys are defined to	do mark	and replace operations.

       The copy	range is specified by setting  two  marks.  The	 text  between
       these marks will	be highlighted.	Press:

	      space  or	enter to set the first or second mark respectively. If
	      mousetrack is set	to `on', marks can  also  be  set  using  left
	      mouse click.

	      Y	 and  y	 used  to mark one whole line or to mark from start of
	      line.

	      W	marks exactly one word.

       Any of these commands can be prefixed with a  repeat  count  number  by
       pressing	digits

	      0..9 which is taken as a repeat count.

       Example:	 "C-a  C-[ H 10	j 5 Y" will copy lines 11 to 15	into the paste
       buffer.

       The folllowing search keys are defined:

	      /	Vi-like	search forward.

	      ?	Vi-like	search backward.

	      C-a s Emacs style	incremental search forward.

	      C-r Emacs	style reverse i-search.

	      n	Find next search pattern.

	      N	Find previous search pattern.

       There are however some keys that	act differently	than in	vi.   Vi  does
       not  allow  one	to  yank  rectangular blocks of	text, but screen does.
       Press: c	or C to	set the	left or	right margin respectively. If  no  re-
       peat count is given, both default to the	current	cursor position.

       Example:	Try this on a rather full text screen:

	      "C-a [ M 20 l SPACE c 10 l 5 j C SPACE".

       This  moves  one	 to the	middle line of the screen, moves in 20 columns
       left, marks the beginning of the	paste buffer, sets  the	 left  column,
       moves  5	columns	down, sets the right column, and then marks the	end of
       the paste buffer. Now try:

	      "C-a [ M 20 l SPACE 10 l 5 j SPACE"

       and notice the difference in the	amount of text copied.

       J joins lines. It toggles between 4 modes: lines	separated by a newline
       character  (012),  lines	 glued	seamless,  lines separated by a	single
       whitespace and comma separated lines. Note that	you  can  prepend  the
       newline	character with a carriage return character, by issuing a "crlf
       on".

       v or V is for all the vi	users with ":set numbers"  -  it  toggles  the
       left margin between column 9 and	1. Press

       a  before  the  final space key to toggle in append mode. Thus the con-
       tents of	the paste buffer will not be overwritten, but is appended to.

       A toggles in append mode	and sets a (second) mark.

       > sets the (second) mark	and writes the contents	of the paste buffer to
       the  screen-exchange file (/tmp/screen-exchange per default) once copy-
       mode is finished.

       This example demonstrates how to	dump the whole	scrollback  buffer  to
       that file: "C-A [ g SPACE G $ >".

       C-g gives information about the current line and	column.

       x  or  o	 exchanges the first mark and the current cursor position. You
       can use this to adjust an already placed	mark.

       C-l ('el') will redraw the screen.

       @ does nothing. Does not	even exit copy mode.

       All keys	not described here exit	copy mode.

       copy_reg	[key]

       No longer exists, use "readreg" instead.

       crlf [on|off]

       This affects the	copying	of text	regions	with the `C-a ['  command.  If
       it  is  set  to	`on', lines will be separated by the two character se-
       quence `CR' - `LF'.  Otherwise (default)	only `LF' is  used.   When  no
       parameter is given, the state is	toggled.

       debug on|off

       Turns runtime debugging on or off. If screen has	been compiled with op-
       tion -DDEBUG debugging available	and is turned  on  per	default.  Note
       that  this command only affects debugging output	from the main "SCREEN"
       process correctly. Debug	output from attacher  processes	 can  only  be
       turned off once and forever.

       defc1 on|off

       Same  as	the c1 command except that the default setting for new windows
       is changed. Initial setting is `on'.

       defautonuke on|off

       Same as the autonuke command except that	the default  setting  for  new
       displays	 is  changed. Initial setting is `off'.	 Note that you can use
       the special `AN'	terminal capability if you want	to have	 a  dependency
       on the terminal type.

       defbce on|off

       Same as the bce command except that the default setting for new windows
       is changed. Initial setting is `off'.

       defbreaktype [tcsendbreak|TIOCSBRK|TCSBRK]

       Choose one of the available methods of generating a  break  signal  for
       terminal	 devices.  The preferred methods are tcsendbreak and TIOCSBRK.
       The third, TCSBRK, blocks the complete screen session for the  duration
       of  the break, but it may be the	only way to generate long breaks.  Tc-
       sendbreak and TIOCSBRK may or may not produce long breaks  with	spikes
       (e.g.  4	per second). This is not only system-dependent,	this also dif-
       fers between serial board drivers.  Calling "defbreaktype" with no  pa-
       rameter displays	the current setting.

       defcharset [set]

       Like  the  charset command except that the default setting for new win-
       dows is changed.	Shows current default if called	without	argument.

       defdynamictitle on|off

       Set default behaviour for new windows regarding if screen should	change
       window title when seeing	proper escape sequence.	See also "TITLES (nam-
       ing windows)" section.

       defescape xy

       Set the default command characters. This	is equivalent to the  "escape"
       except  that  it	is useful multiuser sessions only. In a	multiuser ses-
       sion "escape" changes the command character of the calling user,	 where
       "defescape"  changes the	default	command	characters for users that will
       be added	later.

       defflow on|off|auto [interrupt]

       Same as the flow	command	except that the	default	setting	for  new  win-
       dows  is	 changed. Initial setting is `auto'.  Specifying "defflow auto
       interrupt" is the same as the command-line options -fa and -i.

       defgr on|off

       Same as the gr command except that the default setting for new  windows
       is changed. Initial setting is `off'.

       defhstatus [status]

       The  hardstatus	line  that  all	new windows will get is	set to status.
       This command is useful to make the hardstatus of	every  window  display
       the  window  number  or title or	the like.  Status may contain the same
       directives as in	the window messages, but the directive escape  charac-
       ter is '^E' (octal 005) instead of '%'.	This was done to make a	misin-
       terpretation of program generated hardstatus lines impossible.  If  the
       parameter  status  is omitted, the current default string is displayed.
       Per default the hardstatus line of new windows is empty.

       defencoding enc

       Same as the encoding command except that	the default  setting  for  new
       windows is changed. Initial setting is the encoding taken from the ter-
       minal.

       deflog on|off

       Same as the log command except that the default setting for new windows
       is changed. Initial setting is `off'.

       deflogin	on|off

       Same  as	the login command except that the default setting for new win-
       dows is changed.	This is	initialized with `on' as distributed (see con-
       fig.h.in).

       defmode mode

       The mode	of each	newly allocated	pseudo-tty is set to mode.  Mode is an
       octal number.  When no "defmode"	command	is given, mode 0622 is used.

       defmonitor on|off

       Same as the monitor command except that the  default  setting  for  new
       windows is changed. Initial setting is `off'.

       defmousetrack on|off

       Same  as	the mousetrack command except that the default setting for new
       windows is changed. Initial setting is `off'.

       defnonblock on|off|numsecs

       Same as the nonblock command except that	the default setting  for  dis-
       plays is	changed. Initial setting is `off'.

       defobuflimit limit

       Same  as	 the obuflimit command except that the default setting for new
       displays	is changed. Initial setting is 256 bytes.  Note	that  you  can
       use  the	 special 'OL' terminal capability if you want to have a	depen-
       dency on	the terminal type.

       defscrollback num

       Same as the scrollback command except that the default setting for  new
       windows is changed. Initial setting is 100.

       defshell	command

       Synonym to the shell .screenrc command. See there.

       defsilence on|off

       Same  as	 the  silence  command except that the default setting for new
       windows is changed. Initial setting is `off'.

       defslowpaste msec

       Same as the slowpaste command except that the default setting  for  new
       windows is changed. Initial setting is 0	milliseconds, meaning `off'.

       defutf8 on|off

       Same  as	 the utf8 command except that the default setting for new win-
       dows is changed.	Initial	setting	is `on'	if  screen  was	 started  with
       "-U", otherwise `off'.

       defwrap on|off

       Same  as	 the wrap command except that the default setting for new win-
       dows is changed.	Initially line-wrap is on and can be toggled with  the
       "wrap" command ("C-a r")	or by means of "C-a : wrap on|off".

       defwritelock on|off|auto

       Same  as	 the writelock command except that the default setting for new
       windows is changed. Initially writelocks	will off.

       detach [-h]

       Detach the screen session (disconnect it	from the terminal and  put  it
       into  the background).  This returns you	to the shell where you invoked
       screen.	A detached screen can be resumed by invoking screen  with  the
       -r  option  (see	 also  section	"COMMAND-LINE OPTIONS"). The -h	option
       tells screen to	immediately  close  the	 connection  to	 the  terminal
       ("hangup").

       dinfo

       Show what screen	thinks about your terminal. Useful if you want to know
       why features like color or the alternate	charset	don't work.

       displays

       Shows a tabular listing of  all	currently  connected  user  front-ends
       (displays).  This is most useful	for multiuser sessions.	 The following
       keys can	be used	in displays list:

       -------------------------------------------------------
       k, C-p, or up	       Move up one line.
       -------------------------------------------------------
       j, C-n, or down	       Move down one line.
       -------------------------------------------------------
       C-a or home	       Move to the first line.
       -------------------------------------------------------
       C-e or end	       Move to the last	line.
       -------------------------------------------------------
       C-u or C-d	       Move one	half page up or	down.
       -------------------------------------------------------
       C-b or C-f	       Move one	full page up or	down.
       -------------------------------------------------------
       mouseclick	       Move  to	 the  selected	line.
			       Available when "mousetrack" is
			       set to on.
       -------------------------------------------------------
       space		       Refresh the list
       -------------------------------------------------------
       d		       Detach that display
       -------------------------------------------------------
       D		       Power detach that display
       -------------------------------------------------------
       C-g, enter, or escape   Exit the	list
       -------------------------------------------------------

       The following is	an example of what "displays" could look like:
	      xterm 80x42 jnweiger@/dev/ttyp4	  0(m11)   &rWx
	      facit 80x24 mlschroe@/dev/ttyhf nb 11(tcsh)   rwx
	      xterm 80x42 jnhollma@/dev/ttyp5	  0(m11)   &R.x
	       (A)   (B)     (C)     (D)     (E) (F)(G)	  (H)(I)

       The legend is as	follows:

	      (A) The terminal type known by screen for	this display.

	      (B) Displays geometry as width x height.

	      (C) Username who is logged in at the display.

	      (D) Device name of the display or	the attached device

	      (E) Display is in	blocking or nonblocking	mode.	The  available
	      modes are	"nb", "NB", "Z<", "Z>",	and "BL".

	      (F) Number of the	window

	      (G) Name/title of	window

	      (H) Whether the window is	shared

	      (I) Window permissions. Made up of three characters.

	      +--------------------------------------------------------+
	      |		    Window permissions indicators	       |
	      +-----------------+------------------+-------------------+
	      |	1st character	|  2nd character   |   3rd character   |
	      +----+------------+-----+------------+-----+-------------+
	      |-   |no read	| -   |no write	   | -	 |no execute   |
	      +----+------------+-----+------------+-----+-------------+
	      |r   |read	| w   |write	   | x	 |execute      |
	      +----+------------+-----+------------+-----+-------------+
	      |	   |		| W   |own wlock   |	 |	       |
	      +----+------------+-----+------------+-----+-------------+
	      |Indicators of permissions suppressed by a foreign wlock |
	      +----+------------+-----+------------+-----+-------------+
	      |R   |read only	| .   |no write	   |	 |	       |
	      +----+------------+-----+------------+-----+-------------+
	      "displays"  needs	 a  region size	of at least 10 characters wide
	      and 5 characters high in order to	display.

       digraph [preset[unicode-value]]

       This command prompts the	user for a  digraph  sequence.	The  next  two
       characters  typed  are  looked  up in a builtin table and the resulting
       character is inserted in	the input stream. For example, if the user en-
       ters 'a"', an a-umlaut will be inserted.	If the first character entered
       is a 0 (zero), screen will treat	the following characters (up to	three)
       as an octal number instead.  The	optional argument preset is treated as
       user input, thus	one can	create an "umlaut" key.	 For example the  com-
       mand  "bindkey ^K digraph '"'" enables the user to generate an a-umlaut
       by typing CTRL-K	a.  When a non-zero unicode-value is specified,	a  new
       digraph is created with the specified preset. The digraph is unset if a
       zero value is provided for the unicode-value.

       dumptermcap

       Write the termcap entry for the virtual terminal	optimized for the cur-
       rently	active	 window	  to   the   file  ".termcap"  in  the	user's
       "$HOME/.screen" directory (or wherever screen stores its	 sockets.  See
       the  "FILES"  section  below).	This termcap entry is identical	to the
       value of	the environment	variable $TERMCAP that is set up by screen for
       each  window.  For  terminfo  based systems you will need to run	a con-
       verter like captoinfo and then compile the entry	with tic.

       dynamictitle on|off

       Change behaviour	for windows regarding if screen	should	change	window
       title when seeing proper	escape sequence. See also "TITLES (naming win-
       dows)" section.

       echo [-n] message

       The echo	command	may be used to annoy screen users with a  'message  of
       the day'. Typically installed in	a global /local/etc/screenrc.  The op-
       tion "-n" may be	used to	suppress the line  feed.   See	also  "sleep".
       Echo is also useful for online checking of environment variables.

       encoding	enc [enc]

       Tell  screen how	to interpret the input/output. The first argument sets
       the encoding of the current window. Each	window can emulate a different
       encoding.  The optional second parameter	overwrites the encoding	of the
       connected terminal. It should never be needed as	screen uses the	locale
       setting to detect the encoding.	There is also a	way to select a	termi-
       nal encoding depending on the terminal type by using the	 "KJ"  termcap
       entry.

       Supported  encodings  are eucJP,	SJIS, eucKR, eucCN, Big5, GBK, KOI8-R,
       KOI8-U, CP1251,	UTF-8,	ISO8859-2,  ISO8859-3,	ISO8859-4,  ISO8859-5,
       ISO8859-6,  ISO8859-7,  ISO8859-8,  ISO8859-9,  ISO8859-10, ISO8859-15,
       jis.

       See also	"defencoding", which changes the default setting of a new win-
       dow.

       escape xy

       Set  the	 command character to x	and the	character generating a literal
       command character (by triggering	the "meta" command) to y  (similar  to
       the  -e	option).   Each	 argument is either a single character,	a two-
       character sequence of the form "^x" (meaning "C-x"), a  backslash  fol-
       lowed  by an octal number (specifying the ASCII code of the character),
       or a backslash followed by a second character, such as  "\^"  or	 "\\".
       The default is "^Aa".

       eval command1[command2 ...]

       Parses and executes each	argument as separate command.

       exec [[fdpat]newcommand [args ...]]

       Run  a  unix subprocess (specified by an	executable path	newcommand and
       its optional arguments) in the current window. The flow of data between
       newcommands  stdin/stdout/stderr, the process originally	started	in the
       window (let us call it "application-process") and screen	 itself	 (win-
       dow)  is	controlled by the file descriptor pattern fdpat.  This pattern
       is basically a three character sequence representing stdin, stdout  and
       stderr of newcommand. A dot (.) connects	the file descriptor to screen.
       An exclamation mark (!) causes the file descriptor to be	 connected  to
       the application-process.	A colon	(:) combines both.  User input will go
       to newcommand unless newcommand receives	the application-process'  out-
       put  (fdpats  first  character  is  `!' or `:') or a pipe symbol	(|) is
       added (as a fourth character) to	the end	of fdpat.

       Invoking	`exec' without arguments shows name and	arguments of the  cur-
       rently  running	subprocess  in this window. Only one subprocess	a time
       can be running in each window.

       When a subprocess is running the	`kill' command will affect it  instead
       of the windows process.

       Refer  to  the postscript file `doc/fdpat.ps' for a confusing illustra-
       tion of all 21 possible combinations. Each  drawing  shows  the	digits
       2,1,0  representing  the	 three file descriptors	of newcommand. The box
       marked `W' is the usual pty that	has  the  application-process  on  its
       slave  side.   The  box	marked	`P'  is	the secondary pty that now has
       screen at its master side.

       Abbreviations: Whitespace between the word `exec'  and  fdpat  and  the
       command	can  be	 omitted. Trailing dots	and a fdpat consisting only of
       dots can	be omitted. A simple `|' is synonymous for the pattern `!..|';
       the word	exec can be omitted here and can always	be replaced by `!'.

       Examples:

	      exec ... /bin/sh

	      exec /bin/sh

	      !/bin/sh

		     Creates another shell in the same window, while the orig-
		     inal shell	is still running. Output  of  both  shells  is
		     displayed and user	input is sent to the new /bin/sh.

	      exec !.. stty 19200

	      exec ! stty 19200

	      !!stty 19200

		     Set  the  speed of	the window's tty. If your stty command
		     operates on stdout, then add another `!'.

	      exec !..|	less

	      |less

		     This adds a pager to the window output. The special char-
		     acter  `|'	 is  needed  to	give the user control over the
		     pager although  it	 gets  its  input  from	 the  window's
		     process.  This  works,  because less listens on stderr (a
		     behavior that screen would	not expect  without  the  `|')
		     when  its	stdin  is not a	tty.  Less versions newer than
		     177 fail miserably	here; good old pg still	works.

	      !:sed -n s/.*Error.*/\007/p

		     Sends window output to both, the user and	the  sed  com-
		     mand.  The	sed inserts an additional bell character (oct.
		     007) to the window	output	seen  by  screen.   This  will
		     cause  "Bell  in  window x" messages, whenever the	string
		     "Error" appears in	the window.

       fit

       Change the window size to the size of the current region. This  command
       is needed because screen	doesn't	adapt the window size automatically if
       the window is displayed more than once.

       flow   [on|off|auto]

       Sets the	flow-control mode for this window.  Without parameters it  cy-
       cles the	current	window's flow-control setting from "automatic" to "on"
       to "off".  See the discussion on	"FLOW-CONTROL" later on	in this	 docu-
       ment  for  full details and note, that this is subject to change	in fu-
       ture releases.  Default is set by `defflow'.

       focus [next|prev|up|down|left|right|top|bottom]

       Move the	input focus to the next	region.	This is	done in	a  cyclic  way
       so  that	the top	left region is selected	after the bottom right one. If
       no option is given it defaults to `next'. The next  region  to  be  se-
       lected  is  determined  by  how the regions are layered.	 Normally, the
       next region in the same layer would be selected.	 However, if that next
       region  contains	 one  or  more layers, the first region	in the highest
       layer is	selected first.	If you are at the last region of  the  current
       layer, `next' will move the focus to the	next region in the lower layer
       (if there is a lower layer).  `Prev' cycles in the opposite order.  See
       "split" for more	information about layers.

       The  rest  of  the  options  (`up', `down', `left', `right', `top', and
       `bottom') are more indifferent to layers. The option `up' will move the
       focus  upward  to  the region that is touching the upper	left corner of
       the current region.  `Down' will	move downward to the  region  that  is
       touching	the lower left corner of the current region. The option	`left'
       will move the focus leftward to the region that is touching  the	 upper
       left corner of the current region, while	`right'	will move rightward to
       the region that is touching the upper right corner of the  current  re-
       gion.  Moving left from a left most region or moving right from a right
       most region will	result in no action.

       The option `top'	will move the focus to the very	first  region  in  the
       upper  list  corner of the screen, and `bottom' will move to the	region
       in the bottom right corner of the screen. Moving	up from	a top most re-
       gion or moving down from	a bottom most region will result in no action.

       Useful bindings are (h, j, k, and l as in vi)
	   bind	h focus	left
	   bind	j focus	down
	   bind	k focus	up
	   bind	l focus	right
	   bind	t focus	top
	   bind	b focus	bottom
       Note that k is traditionally bound to the kill command.

       focusminsize [ (	width|max|_ ) (	height|max|_ ) ]

       This  forces  any currently selected region to be automatically resized
       at least	a certain width	and height. All	other surrounding regions will
       be  resized in order to accommodate.  This constraint follows everytime
       the "focus" command is used. The	"resize" command can be	 used  to  in-
       crease  either  dimension of a region, but never	below what is set with
       "focusminsize". The underscore `_' is a	synonym	 for  max.  Setting  a
       width and height	of `0 0' (zero zero) will undo any constraints and al-
       low for manual resizing.	 Without any parameters, the minimum width and
       height is shown.

       gr [on|off]

       Turn GR charset switching on/off. Whenever screen sees an input charac-
       ter with	the 8th	bit set, it will use the charset stored	in the GR slot
       and  print  the	character  with	the 8th	bit stripped. The default (see
       also "defgr") is	not to process	GR  switching  because	otherwise  the
       ISO88591	charset	would not work.

       group [grouptitle]

       Change  or show the group the current window belongs to.	Windows	can be
       moved around between different groups by	specifying  the	 name  of  the
       destination group. Without specifying a group, the title	of the current
       group is	displayed.

       hardcopy	[-h] [file]

       Writes out the currently	displayed image	to the file file,  or,	if  no
       filename	 is specified, to hardcopy.n in	the default directory, where n
       is the number of	the current window.  This either appends or overwrites
       the  file if it exists. See below.  If the option -h is specified, dump
       also the	contents of the	scrollback buffer.

       hardcopy_append on|off

       If set to "on", screen will append to the "hardcopy.n" files created by
       the  command  "C-a h", otherwise	these files are	overwritten each time.
       Default is `off'.

       hardcopydir directory

       Defines a directory where hardcopy files	 will  be  placed.  If	unset,
       hardcopys are dumped in screen's	current	working	directory.

       hardstatus [on|off]

       hardstatus [always]firstline|lastline|message|ignore[string]

       hardstatus string[string]

       This  command  configures the use and emulation of the terminal's hard-
       status line. The	first form toggles whether screen will use  the	 hard-
       ware  status  line  to  display	messages. If the flag is set to	`off',
       these messages are overlaid in reverse video mode at the	display	 line.
       The default setting is `on'.

       The  second form	tells screen what to do	if the terminal	doesn't	have a
       hardstatus line (i.e. the  termcap/terminfo  capabilities  "hs",	 "ts",
       "fs"  and "ds" are not set).  When "firstline/lastline" is used,	screen
       will reserve the	first/last line	of the	display	 for  the  hardstatus.
       "message"  uses	screen's  message  mechanism and "ignore" tells	screen
       never to	display	the hardstatus.	 If you	prepend	the word  "always"  to
       the type	(e.g., "alwayslastline"), screen will use the type even	if the
       terminal	supports a hardstatus.

       The third form specifies	the contents of	the hardstatus line.  '%h'  is
       used as default string, i.e., the stored	hardstatus of the current win-
       dow (settable via "ESC]0;<string>^G"  or	 "ESC_<string>ESC\")  is  dis-
       played.	 You  can  customize this to any string	you like including the
       escapes from the	"STRING	ESCAPES" chapter. If you leave out  the	 argu-
       ment string, the	current	string is displayed.

       You  can	mix the	second and third form by providing the string as addi-
       tional argument.

       height [-w|-d] [lines [cols]]

       Set the display height to a specified number of lines. When no argument
       is given	it toggles between 24 and 42 lines display. You	can also spec-
       ify a width if you want to change both values.	The  -w	 option	 tells
       screen  to  leave  the  display	size unchanged and just	set the	window
       size, -d	vice versa.

       help[class]

       Not really a online help, but displays a	help screen  showing  you  all
       the  key	bindings.  The first pages list	all the	internal commands fol-
       lowed by	their current bindings.	 Subsequent  pages  will  display  the
       custom  commands,  one  command	per key.  Press	space when you're done
       reading each page, or return to exit early.  All	other  characters  are
       ignored.	 If  the  "-c" option is given,	display	all bound commands for
       the specified command class.  See also "DEFAULT KEY BINDINGS" section.

       history

       Usually users work with a shell that allows  easy  access  to  previous
       commands.  For example csh has the command "!!" to repeat the last com-
       mand executed.  Screen allows you to have a primitive way of re-calling
       "the  command that started ...":	You just type the first	letter of that
       command,	then hit `C-a {' and screen tries to find a previous line that
       matches	with  the  `prompt  character' to the left of the cursor. This
       line is pasted into this	window's input queue.  Thus you	have  a	 crude
       command	history	(made up by the	visible	window and its scrollback buf-
       fer).

       hstatus status

       Change the window's hardstatus line to the string status.

       idle [timeout[cmd-args]]

       Sets a command that is run after	the specified number of	seconds	 inac-
       tivity  is reached. This	command	will normally be the "blanker" command
       to create a screen blanker, but it can be any screen  command.	If  no
       command	is  specified,	only the timeout is set. A timeout of zero (or
       the special timeout off)	disables  the  timer.	If  no	arguments  are
       given, the current settings are displayed.

       ignorecase [on|off]

       Tell  screen  to	 ignore	the case of characters in searches. Default is
       `off'. Without any options, the state of	ignorecase is toggled.

       info

       Uses the	message	line to	display	some  information  about  the  current
       window:	the  cursor  position in the form "(column,row)" starting with
       "(1,1)",	the terminal width and height plus the size of the  scrollback
       buffer  in  lines,  like	 in  "(80,24)+50", the current state of	window
       XON/XOFF	flow control is	shown like this	(See also  section  FLOW  CON-
       TROL):

       +---------+----------------------------------------------------------+
       |+flow	 | automatic flow control, currently on.		    |
       +---------+----------------------------------------------------------+
       |-flow	 | automatic flow control, currently off.		    |
       +---------+----------------------------------------------------------+
       |+(+)flow | flow	control	enabled. Agrees	with automatic control.	    |
       +---------+----------------------------------------------------------+
       |-(+)flow | flow	control	disabled. Disagrees with automatic control. |
       +---------+----------------------------------------------------------+
       |+(-)flow | flow	control	enabled. Disagrees with	automatic control.  |
       +---------+----------------------------------------------------------+
       |-(-)flow | flow	control	disabled. Agrees with automatic	control.    |
       +---------+----------------------------------------------------------+
       The  current line wrap setting (`+wrap' indicates enabled, `-wrap' not)
       is also shown. The flags	`ins', `org', `app', `log', `mon'  or  `nored'
       are  displayed when the window is in insert mode, origin	mode, applica-
       tion-keypad mode, has output logging, activity  monitoring  or  partial
       redraw enabled.

       The  currently  active  character set (G0, G1, G2, or G3) and in	square
       brackets	the terminal character sets that are currently	designated  as
       G0  through  G3	is  shown.  If the window is in	UTF-8 mode, the	string
       "UTF-8" is shown	instead.

       Additional modes	depending on the type of the window are	 displayed  at
       the end of the status line (See also chapter "WINDOW TYPES").

       If  the	state  machine	of  the	 terminal emulator is in a non-default
       state, the info line is started with a string identifying  the  current
       state.

       For system information use the "time" command.

       ins_reg [key]

       No longer exists, use "paste" instead.

       kill

       Kill current window.

       If  there is an `exec' command running then it is killed. Otherwise the
       process (shell) running in the window receives a	HANGUP condition,  the
       window  structure  is removed and screen	(your display) switches	to an-
       other window.  When the last window is destroyed, screen	exits.	 After
       a kill screen switches to the previously	displayed window.

       Note:  Emacs  users  should  keep  this command in mind,	when killing a
       line.  It is recommended	not to use "C-a" as the	screen escape  key  or
       to rebind kill to "C-a K".

       lastmsg

       Redisplay  the  last  contents  of  the message/status line.  Useful if
       you're typing when a message appears, because  the  message  goes  away
       when you	press a	key (unless your terminal has a	hardware status	line).
       Refer to	the commands "msgwait" and "msgminwait"	for fine tuning.

       layout new [title]

       Create a	new layout. The	screen will change to one whole	region and  be
       switched	 to the	blank window. From here, you build the regions and the
       windows they show as you	desire.	The new	layout will be	numbered  with
       the  smallest available integer,	starting with zero. You	can optionally
       give a title to your new	layout.	 Otherwise, it will have a default ti-
       tle  of	"layout".  You	can always change the title later by using the
       command layout title.

       layout remove [n|title]

       Remove, or in other words, delete the specified layout. Either the num-
       ber or the title	can be specified. Without either specification,	screen
       will remove the current layout.

       Removing	a layout does not affect your set windows or regions.

       layout next

       Switch to the next layout available

       layout prev

       Switch to the previous layout available

       layout select [n|title]

       Select the desired layout. Either the number or the title can be	speci-
       fied.  Without  either  specification, screen will prompt and ask which
       screen is desired. To see which layouts are available, use  the	layout
       show command.

       layout show

       List  on	 the  message line the number(s) and title(s) of the available
       layout(s). The current layout is	flagged.

       layout title [title]

       Change or display the title of the current layout. A string given  will
       be  used	to name	the layout. Without any	options, the current title and
       number is displayed on the message line.

       layout number [n]

       Change or display the number of the current layout.  An	integer	 given
       will  be	 used  to  number the layout. Without any options, the current
       number and title	is displayed on	the message line.

       layout attach [title|:last]

       Change or display which layout to reattach  back	 to.  The  default  is
       :last, which tells screen to reattach back to the last used layout just
       before detachment. By supplying a title,	You  can  instruct  screen  to
       reattach	 to  a	particular layout regardless which one was used	at the
       time of detachment. Without any options,	the layout to reattach to will
       be shown	in the message line.

       layout save [n|title]

       Remember	the current arrangement	of regions. When used, screen will re-
       member the arrangement of vertically and	 horizontally  split  regions.
       This  arrangement  is  restored	when a screen session is reattached or
       switched	back from a different layout.  If  the	session	 ends  or  the
       screen  process dies, the layout	arrangements are lost. The layout dump
       command should help in this siutation. If a number  or  title  is  sup-
       plied,  screen will remember the	arrangement of that particular layout.
       Without any options, screen will	remember the current layout.

       Saving your regions can be done automatically by	using the  layout  au-
       tosave command.

       layout autosave [on|off]

       Change  or  display  the	status of automatcally saving layouts. The de-
       fault is	on, meaning when screen	is detached or changed to a  different
       layout,	the  arrangement  of regions and windows will be remembered at
       the time	of change and restored upon return.  If	 autosave  is  set  to
       off,  that arrangement will only	be restored to either to the last man-
       ual save, using layout save, or to when the layout was  first  created,
       to  a  single region with a single window. Without either an on or off,
       the current status is displayed on the message line.

       layout dump [filename]

       Write to	a file the order of splits made	in the current layout. This is
       useful  to recreate the order of	your regions used in your current lay-
       out. Only the current layout is recorded. While the order  of  the  re-
       gions are recorded, the sizes of	those regions and which	windows	corre-
       spond to	which regions are not. If no filename is  specified,  the  de-
       fault  is  layout-dump,	saved in the directory that the	screen process
       was started in. If the file already exists, layout dump will append  to
       that file. As an	example:

		C-a : layout dump /home/user/.screenrc

       will save or append the layout to the user's .screenrc file.

       license

       Display	the  disclaimer	 page. This is done whenever screen is started
       without	options,  which	 should	 be  often  enough.   See   also   the
       "startup_message" command.

       lockscreen

       Lock  this  display.   Call  a  screenlock  program  (/local/bin/lck or
       /usr/bin/lock or	a builtin if no	other is available). Screen  does  not
       accept  any  command keys until this program terminates.	Meanwhile pro-
       cesses in the windows may continue, as the  windows  are	 in  the  `de-
       tached'	state. The screenlock program may be changed through the envi-
       ronment variable	$LOCKPRG (which	must be	set in the  shell  from	 which
       screen is started) and is executed with the user's uid and gid.

       Warning:	 When you leave	other shells unlocked and you have no password
       set on screen, the lock is void:	One could easily re-attach from	an un-
       locked shell. This feature should rather	be called `lockterminal'.

       log [on|off]

       Start/stop writing output of the	current	window to a file "screenlog.n"
       in the window's default directory, where	n is the number	of the current
       window.	This filename can be changed with the `logfile'	command. If no
       parameter is given, the state of	logging	is toggled. The	session	log is
       appended	to the previous	contents of the	file if	it already exists. The
       current contents	and the	contents of the	scrollback history are not in-
       cluded in the session log.  Default is `off'.

       logfile filename

       logfile flush secs

       Defines the name	the log	files will get.	The default is "screenlog.%n".
       The second form changes the number of seconds screen will  wait	before
       flushing	the logfile buffer to the file-system. The default value is 10
       seconds.

       login [on|off]

       Adds or removes the entry in the	utmp database  file  for  the  current
       window.	This controls if the window is `logged in'.  When no parameter
       is given, the login state of the	window is  toggled.   Additionally  to
       that  toggle,  it  is convenient	having a `log in' and a	`log out' key.
       E.g. `bind I login on' and `bind	O login	off' will map these keys to be
       C-a  I  and C-a O.  The default setting (in config.h.in)	should be "on"
       for a screen that runs under suid-root.	Use the	"deflogin" command  to
       change  the default login state for new windows.	Both commands are only
       present when screen has been compiled with utmp support.

       logtstamp [on|off]

       logtstamp after [secs]

       logtstamp string
       [string]

       This command controls logfile time-stamp	mechanism of screen.  If time-
       stamps  are  turned  "on",  screen adds a string	containing the current
       time to the logfile after two minutes of	inactivity.  When output  con-
       tinues  and  more  than another two minutes have	passed,	a second time-
       stamp is	added to document the restart of the output.  You  can	change
       this  timeout  with  the	 second	form of	the command. The third form is
       used for	customizing the	time-stamp string (`-- %n:%t --	time-stamp  --
       %M/%d/%y	%c:%s --\n' by default).

       mapdefault

       Tell  screen  that the next input character should only be looked up in
       the default bindkey table. See also "bindkey".

       mapnotnext

       Like mapdefault,	but don't even look in the default bindkey table.

       maptimeout [timeout]

       Set the inter-character timer for input sequence	detection to a timeout
       of  timeout  ms.	The default timeout is 300ms. Maptimeout with no argu-
       ments shows the current setting.	 See also "bindkey".

       markkeys	string

       This is a method	of changing the	keymap	used  for  copy/history	 mode.
       The  string  is made up of oldchar=newchar pairs	which are separated by
       `:'. Example: The string	"B=^B:F=^F" will change	the keys `C-b' and `C-
       f' to the vi style binding (scroll up/down fill page).  This happens to
       be the  default	binding	 for  `B'  and	`F'.   The  command  "markkeys
       h=^B:l=^F:$=^E" would set the mode for an emacs-style binding.  If your
       terminal	sends characters, that cause you to abort copy mode, then this
       command	may help by binding these characters to	do nothing.  The no-op
       character is `@'	and is used like this: "markkeys @=L=H"	if you do  not
       want to use the `H' or `L' commands any longer.	As shown in this exam-
       ple, multiple keys can be assigned to one function in a	single	state-
       ment.

       maxwin num

       Set  the	 maximum  window number	screen will create. Doesn't affect al-
       ready existing windows. The number can be increased only	when there are
       no existing windows.

       meta

       Insert  the  command  character	(C-a)  in  the	current	window's input
       stream.

       monitor [on|off]

       Toggles activity	monitoring of windows.	When monitoring	is  turned  on
       and  an	affected  window is switched into the background, you will re-
       ceive the activity notification message in the status line at the first
       sign  of	 output	 and the window	will also be marked with an `@'	in the
       window-status display.  Monitoring is initially off for all windows.

       mousetrack [on|off]

       This command determines whether screen will  watch  for	mouse  clicks.
       When  this  command is enabled, regions that have been split in various
       ways can	be selected by pointing	to them	with a mouse and left-clicking
       them. Without specifying	on or off, the current state is	displayed. The
       default state is	determined by the "defmousetrack" command.

       msgminwait sec

       Defines the time	screen delays a	new message when one message  is  cur-
       rently displayed.  The default is 1 second.

       msgwait sec

       Defines	the  time a message is displayed if screen is not disturbed by
       other activity. The default is 5	seconds.

       multiuser on|off

       Switch between singleuser and multiuser mode. Standard screen operation
       is  singleuser.	In  multiuser  mode  the  commands `acladd', `aclchg',
       `aclgrp'	and `acldel' can be used to enable (and	disable)  other	 users
       accessing this screen session.

       nethack on|off

       Changes the kind	of error messages used by screen.  When	you are	famil-
       iar with	the game "nethack", you	may enjoy the  nethack-style  messages
       which will often	blur the facts a little, but are much funnier to read.
       Anyway, standard	messages often tend to be unclear as well.
       This option is only available if	screen was compiled with  the  NETHACK
       flag defined. The default setting is then determined by the presence of
       the environment variable	$NETHACKOPTIONS	and the	file ~/.nethackrc - if
       either one is present, the default is on.

       next

       Switch  to the next window.  This command can be	used repeatedly	to cy-
       cle through the list of windows.

       nonblock	[on|off|numsecs]

       Tell screen how to deal with user interfaces (displays) that  cease  to
       accept output. This can happen if a user	presses	^S or a	TCP/modem con-
       nection gets cut	but no hangup is received. If nonblock is off (this is
       the default) screen waits until the display restarts to accept the out-
       put. If nonblock	is on, screen waits until the timeout is  reached  (on
       is  treated  as	1s).  If the display still doesn't receive characters,
       screen will consider it "blocked" and stop sending characters to	it. If
       at  some	time it	restarts to accept characters, screen will unblock the
       display and redisplay the updated window	contents.

       number [[+|-]n]

       Change the current window's number. If the given	number	n  is  already
       used  by	another	window,	both windows exchange their numbers. If	no ar-
       gument is specified, the	current	window number (and  title)  is	shown.
       Using `+' or `-'	will change the	window's number	by the relative	amount
       specified.

       obuflimit [limit]

       If the output buffer contains more bytes	than the specified  limit,  no
       more  data  will	be read	from the windows. The default value is 256. If
       you have	a fast display (like xterm), you can set  it  to  some	higher
       value. If no argument is	specified, the current setting is displayed.

       only

       Kill all	regions	but the	current	one.

       other

       Switch  to  the	window	displayed  previously.	If this	window does no
       longer exist, other has the same	effect as next.

       partial on|off

       Defines whether the display should be refreshed (as with	redisplay) af-
       ter switching to	the current window. This command only affects the cur-
       rent window.  To	immediately affect all windows use the allpartial com-
       mand.  Default is `off',	of course.  This default is fixed, as there is
       currently no defpartial command.

       password	[crypted_pw]

       Present a crypted password in your ".screenrc" file and screen will ask
       for  it,	whenever someone attempts to resume a detached.	This is	useful
       if you have privileged programs running under screen and	 you  want  to
       protect	your session from reattach attempts by another user masquerad-
       ing as your uid (i.e. any superuser.)  If no crypted password is	speci-
       fied, screen prompts twice for typing a password	and places its encryp-
       tion in the paste buffer.  Default is `none',  this  disables  password
       checking.

       paste [registers	[dest_reg]]

       Write  the  (concatenated)  contents  of	the specified registers	to the
       stdin queue of the current window. The register '.' is treated  as  the
       paste  buffer. If no parameter is given the user	is prompted for	a sin-
       gle register to paste.  The paste buffer	can be filled with  the	 copy,
       history	and  readbuf commands.	Other registers	can be filled with the
       register, readreg and paste commands.  If paste is called with a	second
       argument,  the  contents	 of the	specified registers is pasted into the
       named destination register rather than the window. If '.'  is  used  as
       the  second  argument,  the  displays  paste buffer is the destination.
       Note, that "paste" uses a wide variety of resources: Whenever a	second
       argument	 is  specified	no  current  window is needed. When the	source
       specification only contains registers (not the paste buffer) then there
       need not	be a current display (terminal attached), as the registers are
       a global	resource. The paste buffer exists once for every user.

       pastefont [on|off]

       Tell screen to include font information in the paste  buffer.  The  de-
       fault  is  not  to  do  so. This	command	is especially useful for multi
       character fonts like kanji.

       pow_break

       Reopen the window's terminal line  and  send  a	break  condition.  See
       `break'.

       pow_detach

       Power  detach.  Mainly the same as detach, but also sends a HANGUP sig-
       nal to the parent process of screen.  CAUTION: This will	 result	 in  a
       logout, when screen was started from your login-shell.

       pow_detach_msg [message]

       The message specified here is output whenever a `Power detach' was per-
       formed. It may be used as a replacement for a logout message or to  re-
       set baud	rate, etc.  Without parameter, the current message is shown.

       prev

       Switch  to  the window with the next lower number.  This	command	can be
       used repeatedly to cycle	through	the list of windows.

       printcmd	[cmd]

       If cmd is not an	empty string, screen will not use the  terminal	 capa-
       bilities	 "po/pf"  if  it detects an ansi print sequence	ESC [ 5	i, but
       pipe the	output into cmd.  This should normally be a command like "lpr"
       or  "'cat  >  /tmp/scrprint'".  printcmd	without	a command displays the
       current setting.	 The ansi sequence ESC \ ends printing and closes  the
       pipe.

       Warning:	 Be careful with this command! If other	user have write	access
       to your terminal, they will be able to fire off print commands.

       process [key]

       Stuff the contents of the specified register into screen's input	queue.
       If  no argument is given	you are	prompted for a register	name. The text
       is parsed as if it had been typed in from  the  user's  keyboard.  This
       command can be used to bind multiple actions to a single	key.

       quit

       Kill all	windows	and terminate screen.  Note that on VT100-style	termi-
       nals the	keys C-4 and C-\ are identical.	 This makes the	default	 bind-
       ings  dangerous:	 Be  careful not to type C-a C-4 when selecting	window
       no. 4.  Use the empty bind command (as in "bind '^\'") to remove	a  key
       binding.

       readbuf [encoding] [filename]

       Reads  the  contents  of	the specified file into	the paste buffer.  You
       can tell	screen the encoding of the file	via the	-e option.  If no file
       is  specified, the screen-exchange filename is used.  See also "buffer-
       file" command.

       readreg [encoding] [register [filename]]

       Does one	of two things, dependent on number of arguments: with zero  or
       one arguments it	duplicates the paste buffer contents into the register
       specified or entered at the prompt. With	two  arguments	it  reads  the
       contents	of the named file into the register, just as readbuf reads the
       screen-exchange file into the paste buffer.  You	can  tell  screen  the
       encoding	 of  the  file	via the	-e option.  The	following example will
       paste the system's password file	into the screen	window (using register
       p, where	a copy remains):

		C-a : readreg p	/etc/passwd
		C-a : paste p

       redisplay

       Redisplay  the  current	window.	Needed to get a	full redisplay when in
       partial redraw mode.

       register	[-eencoding]key-string

       Save the	specified string to the	register key.	The  encoding  of  the
       string  can  be specified via the -e option.  See also the "paste" com-
       mand.

       remove

       Kill the	current	region.	This is	a no-op	if there is only one region.

       removebuf

       Unlinks the screen-exchange file	used by	the  commands  "writebuf"  and
       "readbuf".

       rendition bell |	monitor	| silence | so	attr  [	color ]

       Change  the  way	screen renders the titles of windows that have monitor
       or bell flags set in caption  or	 hardstatus  or	 windowlist.  See  the
       "STRING	ESCAPES" chapter for the syntax	of the modifiers.  The default
       for monitor is currently	"=b " (bold, active colors), for bell  "=ub  "
       (underline, bold	and active colors), and	"=u " for silence.

       reset

       Reset  the  virtual  terminal  to  its  "power-on"  values. Useful when
       strange settings	(like scroll regions or	graphics  character  set)  are
       left over from an application.

       resize [-h|-v|-b|-l|-p] [[+|-] n[%] |=|max|min|_|0]

       Resize  the  current region. The	space will be removed from or added to
       the surrounding regions depending on the	 order	of  the	 splits.   The
       available  options  for	resizing are `-h'(horizontal), `-v'(vertical),
       `-b'(both), `-l'(local to layer), and  `-p'(perpendicular).  Horizontal
       resizes	will add or remove width to a region, vertical will add	or re-
       move height, and	both will add or remove	size from both dimensions. Lo-
       cal  and	perpendicular are similar to horizontal	and vertical, but they
       take in account of how a	region was split.  If a	 region's  last	 split
       was  horizontal,	 a local resize	will work like a vertical resize. If a
       region's	last split was vertical, a local resize	will work like a hori-
       zontal resize. Perpendicular resizes work in opposite of	local resizes.
       If no option is specified, local	is the default.

       The amount of lines to add or remove can	be expressed a couple of  dif-
       ferent  ways. By	specifying a number n by itself	will resize the	region
       by that absolute	amount.	You can	specify	a relative amount by prefixing
       a  plus	`+' or minus `-' to the	amount,	such as	adding +n lines	or re-
       moving -n lines.	Resizing can also be expressed as an absolute or rela-
       tive  percentage	 by postfixing a percent sign `%'. Using zero `0' is a
       synonym for `min' and using an underscore `_' is	a synonym for `max'.

       Some examples are:

       resize +N
	      increase current region by N

       resize -N
	      decrease current region by N

       resize  N
	      set current region to N

       resize 20%
	      set current region to 20%	of original size

       resize +20%
	      increase current region by 20%

       resize -b =
	      make all windows equally

       resize  max
	      maximize current region

       resize  min
	      minimize current region

       Without any arguments, screen will prompt for how you would like	to re-
       size the	current	region.

       See  "focusminsize"  if	you want to restrict the minimun size a	region
       can have.

       screen [-opts] [n] [cmd [args]|//group]

       Establish a new window.	The flow-control options (-f,  -fn  and	 -fa),
       title  (a.k.a.) option (-t), login options (-l and -ln) , terminal type
       option (-T <term>), the all-capability-flag (-a)	and scrollback	option
       (-h  <num>)  may	be specified with each command.	 The option (-M) turns
       monitoring on for this window.  The option (-L) turns output logging on
       for  this  window.  If an optional number n in the range	0..MAXWIN-1 is
       given, the window number	n is assigned to the newly created window (or,
       if  this	 number	 is  already in-use, the next available	number).  If a
       command is specified after "screen", this command (with the given argu-
       ments)  is  started  in	the window; otherwise, a shell is created.  If
       //group is supplied, a container-type window is created in which	 other
       windows may be created inside it.

       Thus, if	your ".screenrc" contains the lines

		# example for .screenrc:
		screen 1
		screen -fn -t foobar -L	2 telnet foobar

       screen creates a	shell window (in window	#1) and	a window with a	TELNET
       connection to the machine foobar	(with no flow-control using the	 title
       "foobar"	 in window #2) and will	write a	logfile	("screenlog.2")	of the
       telnet session.	Note, that unlike previous versions of screen no addi-
       tional default window is	created	when "screen" commands are included in
       your ".screenrc"	file. When the	initialization	is  completed,	screen
       switches	 to  the  last	window specified in your .screenrc file	or, if
       none, opens a default window #0.

       Screen has built	in some	functionality of "cu" and "telnet".  See  also
       chapter "WINDOW TYPES".

       scrollback num

       Set  the	 size  of the scrollback buffer	for the	current	windows	to num
       lines. The default scrollback is	100 lines.  See	also  the  "defscroll-
       back" command and use "info" to view the	current	setting. To access and
       use the contents	in the scrollback buffer, use the "copy" command.

       select [WindowID]

       Switch to the window identified by WindowID.  This can be a prefix of a
       window title (alphanumeric window name) or a window number.  The	param-
       eter is optional	and if omitted,	you get	prompted  for  an  identifier.
       When  a	new  window  is	established, the first available number	is as-
       signed to this window.  Thus, the first window can be activated by "se-
       lect  0".   The	number	of  windows  is	limited	at compile-time	by the
       MAXWIN configuration parameter (which defaults to 40).  There  are  two
       special	WindowIDs,  "-"	 selects the internal blank window and "." se-
       lects the current window. The latter is useful if  used	with  screen's
       "-X" option.

       sessionname [name]

       Rename  the  current  session.  Note,  that for "screen -list" the name
       shows up	with the process-id prepended. If the argument "name" is omit-
       ted,  the name of this session is displayed. Caution: The $STY environ-
       ment variables will still reflect the old name in pre-existing  shells.
       This may	result in confusion. Use of this command is generally discour-
       aged. Use the "-S" command-line option if you want to name a  new  ses-
       sion.  The default is constructed from the tty and host names.

       setenv [var [string]]

       Set the environment variable var	to value string.  If only var is spec-
       ified, the user will be prompted	to enter a value.   If	no  parameters
       are  specified,	the user will be prompted for both variable and	value.
       The environment is inherited by all subsequently	forked shells.

       setsid [on|off]

       Normally	screen uses different sessions and process groups for the win-
       dows. If	setsid is turned off, this is not done anymore and all windows
       will be in the same process group as the	screen backend	process.  This
       also  breaks job-control, so be careful.	 The default is	on, of course.
       This command is probably	useful only in rare circumstances.

       shell command

       Set the command to be used to create a new shell.  This	overrides  the
       value of	the environment	variable $SHELL.  This is useful if you'd like
       to run a	tty-enhancer which is expecting	to execute the program	speci-
       fied  in	$SHELL.	 If the	command	begins with a '-' character, the shell
       will be started as a login-shell. Typical shells	do only	 minimal  ini-
       tialization when	not started as a login-shell.  E.g. Bash will not read
       your "~/.bashrc"	unless it is a login-shell.

       shelltitle title

       Set the title for all shells created during startup or by the  C-A  C-c
       command.	  For  details about what a title is, see the discussion enti-
       tled "TITLES (naming windows)".

       silence [on|off|sec]

       Toggles silence monitoring of windows.  When silence is turned  on  and
       an  affected  window  is	switched into the background, you will receive
       the silence notification	message	in the status line after  a  specified
       period of inactivity (silence). The default timeout can be changed with
       the `silencewait' command or by specifying a number of seconds  instead
       of `on' or `off'.  Silence is initially off for all windows.

       silencewait sec

       Define  the time	that all windows monitored for silence should wait be-
       fore displaying a message. Default 30 seconds.

       sleep num

       This command will pause the execution of	a .screenrc file for num  sec-
       onds.   Keyboard	 activity  will	end the	sleep.	It may be used to give
       users a chance to read the messages output by "echo".

       slowpaste msec

       Define the speed	at which text is inserted into the current  window  by
       the paste ("C-a ]") command.  If	the slowpaste value is nonzero text is
       written character by character.	screen will make a pause of msec  mil-
       liseconds after each single character write to allow the	application to
       process its input. Only use slowpaste if	your underlying	system exposes
       flow control problems while pasting large amounts of text.

       sort

       Sort the	windows	in alphabetical	order of the window tiles.

       source file

       Read and	execute	commands from file file. Source	commands may be	nested
       to a maximum recursion level of ten. If file is not  an	absolute  path
       and screen is already processing	a source command, the parent directory
       of the running source command file is used to search for	the  new  com-
       mand file before	screen's current directory.

       Note  that  termcap/terminfo/termcapinfo	 commands only work at startup
       and reattach time, so they must be reached  via	the  default  screenrc
       files to	have an	effect.

       sorendition [attr[color]]

       This command is deprecated. See "rendition so" instead.

       split[-v]

       Split  the current region into two new ones. All	regions	on the display
       are resized to make room	for the	new region. The	blank window  is  dis-
       played  in the new region. The default is to create a horizontal	split,
       putting the new regions on the top and bottom of	each other. Using `-v'
       will create a vertical split, causing the new regions to	appear side by
       side of each other.  Use	the "remove" or	the "only" command  to	delete
       regions.	 Use "focus" to	toggle between regions.

       When  a	region	is split opposite of how it was	previously split (that
       is, vertical then horizontal or horizontal then vertical), a new	 layer
       is  created.  The  layer	is used	to group together the regions that are
       split the same. Normally, as a user, you	should not  see	 nor  have  to
       worry about layers, but they will affect	how some commands ("focus" and
       "resize") behave.

       With this current implementation	of screen, scrolling data will	appear
       much  slower  in	 a  vertically split region than one that is not. This
       should be taken into consideration if you need to use  system  commands
       such as "cat" or	"tail -f".

       startup_message on|off

       Select  whether	you  want  to see the copyright	notice during startup.
       Default is `on',	as you probably	noticed.

       status [top|up|down|bottom] [left|right]

       The status window by default is in bottom-left corner. This command can
       move  status  messages  to any corner of	the screen. top	is the same as
       up, down	is the same as bottom.

       stuff [string]

       Stuff the string	string in the input  buffer  of	 the  current  window.
       This  is	like the "paste" command but with much less overhead.  Without
       a parameter, screen will	prompt for a  string  to  stuff.   You	cannot
       paste large buffers with	the "stuff" command. It	is most	useful for key
       bindings. See also "bindkey".

       su [username [password [password2]]]

       Substitute the user of a	display. The command prompts for  all  parame-
       ters  that  are omitted.	If passwords are specified as parameters, they
       have to be specified un-crypted.	The first password is matched  against
       the systems passwd database, the	second password	is matched against the
       screen password as set with the commands	"acladd" or "password".	  "Su"
       may  be	useful	for the	screen administrator to	test multiuser setups.
       When the	identification fails, the user	has  access  to	 the  commands
       available  for  user nobody.  These are "detach", "license", "version",
       "help" and "displays".

       suspend

       Suspend screen.	The windows are	in the `detached' state, while	screen
       is  suspended.  This  feature  relies on	the shell being	able to	do job
       control.

       term term

       In each window's	environment screen opens, the $TERM variable is	set to
       "screen"	by default.  But when no description for "screen" is installed
       in the local termcap or terminfo	data base, you set $TERM to  -	say  -
       "vt100".	 This  won't do	much harm, as screen is	VT100/ANSI compatible.
       The use of the "term" command is	discouraged for	 non-default  purpose.
       That  is,  one  may want	to specify special $TERM settings (e.g.	vt100)
       for the next "screen rlogin  othermachine"  command.  Use  the  command
       "screen -T vt100	rlogin othermachine" rather than setting and resetting
       the default.

       termcap term terminal-tweaks[window-tweaks]

       terminfo	term terminal-tweaks[window-tweaks]

       termcapinfo term	terminal-tweaks[window-tweaks]

       Use this	command	to modify your terminal's termcap entry	without	 going
       through	all  the  hassles involved in creating a custom	termcap	entry.
       Plus, you can optionally	customize the termcap generated	for  the  win-
       dows.   You have	to place these commands	in one of the screenrc startup
       files, as they are meaningless once the terminal	emulator is booted.

       If your system uses the terminfo	database rather	than  termcap,	screen
       will  understand	 the `terminfo'	command, which has the same effects as
       the `termcap' command.  Two separate commands are  provided,  as	 there
       are  subtle  syntactic  differences,  e.g. when parameter interpolation
       (using `%') is required.	Note that termcap names	 of  the  capabilities
       have to be used with the	`terminfo' command.

       In many cases, where the	arguments are valid in both terminfo and term-
       cap syntax, you can use the command  `termcapinfo',  which  is  just  a
       shorthand  for a	pair of	`termcap' and `terminfo' commands with identi-
       cal arguments.

       The first argument specifies which terminal(s) should  be  affected  by
       this definition.	 You can specify multiple terminal names by separating
       them with `|'s.	Use `*'	to match all terminals and `vt*' to match  all
       terminals that begin with "vt".

       Each  tweak argument contains one or more termcap defines (separated by
       `:'s) to	be inserted at the start of the	appropriate termcap entry, en-
       hancing	it  or	overriding  existing values.  The first	tweak modifies
       your terminal's termcap,	and contains definitions  that	your  terminal
       uses to perform certain functions.  Specify a null string to leave this
       unchanged (e.g. '').  The second	(optional) tweak modifies all the win-
       dow  termcaps,  and  should contain definitions that screen understands
       (see the	"VIRTUAL TERMINAL" section).

       Some examples:

	      termcap xterm*  LP:hs@

       Informs screen that all terminals that begin  with  `xterm'  have  firm
       auto-margins  that  allow the last position on the screen to be updated
       (LP), but they don't really have	a status line (no 'hs' - append	`@' to
       turn  entries  off).   Note  that we assume `LP'	for all	terminal names
       that start with "vt", but only if you don't specify a  termcap  command
       for that	terminal.
	      termcap vt*  LP

       termcap vt102|vt220  Z0=\E[?3h:Z1=\E[?3l

       Specifies  the firm-margined `LP' capability for	all terminals that be-
       gin with	`vt', and the second line will also add	 the  escape-sequences
       to switch into (Z0) and back out	of (Z1)	132-character-per-line mode if
       this is a VT102 or VT220.  (You must specify Z0 and Z1 in your  termcap
       to use the width-changing commands.)

	      termcap vt100  ""	 l0=PF1:l1=PF2:l2=PF3:l3=PF4

       This  leaves  your vt100	termcap	alone and adds the function key	labels
       to each window's	termcap	entry.

	      termcap h19|z19  am@:im=\E@:ei=\EO  dc=\E[P

       Takes a h19 or z19 termcap and turns off	auto-margins (am@) and enables
       the  insert  mode (im) and end-insert (ei) capabilities (the `@'	in the
       `im' string is after the	`=', so	it is part of the string).  Having the
       `im'  and  `ei' definitions put into your terminal's termcap will cause
       screen to automatically advertise the  character-insert	capability  in
       each  window's termcap.	Each window will also get the delete-character
       capability (dc) added to	its termcap, which screen will translate  into
       a  line-update  for  the	 terminal (we're pretending it doesn't support
       character deletion).

       If you would like to fully specify each	window's  termcap  entry,  you
       should  instead	set  the  $SCREENCAP variable prior to running screen.
       See the discussion on the "VIRTUAL TERMINAL" in this  manual,  and  the
       termcap(5) man page for more information	on termcap definitions.

       time   [string]

       Uses  the  message  line	to display the time of day, the	host name, and
       the load	averages over 1, 5, and	15 minutes (if this  is	 available  on
       your system).  For window specific information, use "info".

       If a string is specified, it changes the	format of the time report like
       it is described in the "STRING ESCAPES" chapter.	Screen uses a  default
       of "%c:%s %M %d %H%? %l%?".

       title [windowtitle]

       Set the name of the current window to windowtitle. If no	name is	speci-
       fied, screen prompts for	one. This command was known as `aka' in	previ-
       ous releases.

       unbindall

       Unbind  all the bindings. This can be useful when screen	is used	solely
       for its detaching abilities, such as when letting a console application
       run  as a daemon. If, for some reason, it is necessary to bind commands
       after this, use 'screen -X'.

       unsetenv	var

       Unset an	environment variable.

       utf8 [on|off[on|off]]

       Change the encoding used	in the current window. If utf8 is enabled, the
       strings	sent to	the window will	be UTF-8 encoded and vice versa. Omit-
       ting the	parameter toggles the setting. If a second parameter is	given,
       the display's encoding is also changed (this should rather be done with
       screen's	"-U" option).  See also	"defutf8", which changes  the  default
       setting of a new	window.

       vbell [on|off]

       Sets  the  visual  bell setting for this	window.	Omitting the parameter
       toggles the setting. If vbell is	switched on, but  your	terminal  does
       not support a visual bell, a `vbell-message' is displayed in the	status
       line when the bell character (^G) is received.  Visual bell support  of
       a terminal is defined by	the termcap variable `vb' (terminfo: 'flash').

       Per  default,  vbell  is	 off, thus the audible bell is used.  See also
       `bell_msg'.

       vbell_msg [message]

       Sets the	visual bell message. message is	printed	to the status line  if
       the  window  receives  a	bell character (^G), vbell is set to "on", but
       the terminal does not support a visual bell.  The  default  message  is
       "Wuff, Wuff!!".	Without	a parameter, the current message is shown.

       vbellwait sec

       Define  a  delay	 in seconds after each display of screen's visual bell
       message.	The default is 1 second.

       verbose [on|off]

       If verbose is switched on, the command name is echoed, whenever a  win-
       dow  is	created	 (or  resurrected  from	zombie state). Default is off.
       Without a parameter, the	current	setting	is shown.

       version

       Print the current version and the compile date in the status line.

       wall message

       Write a message to all displays.	The message will appear	in the	termi-
       nal's status line.

       width [-w|-d] [cols [lines]]

       Toggle  the  window  width between 80 and 132 columns or	set it to cols
       columns if an argument is specified.  This requires a capable  terminal
       and  the	 termcap entries "Z0" and "Z1".	 See the "termcap" command for
       more information. You can also specify a	new  height  if	 you  want  to
       change  both  values.   The -w option tells screen to leave the display
       size unchanged and just set the window size, -d vice versa.

       windowlist [-b] [-m] [-g]

       windowlist string [string]

       windowlist title	[title]

       Display all windows in a	table for visual window	selection.  If	screen
       was  in a window	group, screen will back	out of the group and then dis-
       play the	windows	in that	group.	If the -b option is given, screen will
       switch to the blank window before presenting the	list, so that the cur-
       rent window is also selectable.	The -m option changes the order	of the
       windows,	 instead of sorting by window numbers screen uses its internal
       most-recently-used list.	 The -g	option will show  the  windows	inside
       any groups in that level	and downwards.

       The following keys are used to navigate in "windowlist":

       ---------------------------------------------------------------------
       k, C-p, or up	  Move up one line.
       ---------------------------------------------------------------------
       j, C-n, or down	  Move down one	line.
       ---------------------------------------------------------------------
       C-g or escape	  Exit windowlist.
       ---------------------------------------------------------------------
       C-a or home	  Move to the first line.
       ---------------------------------------------------------------------
       C-e or end	  Move to the last line.
       ---------------------------------------------------------------------
       C-u or C-d	  Move one half	page up	or down.
       ---------------------------------------------------------------------
       C-b or C-f	  Move one full	page up	or down.
       ---------------------------------------------------------------------
       0..9		  Using	the number keys, move to the selected line.
       ---------------------------------------------------------------------
       mouseclick	  Move to the selected line. Available when "mouse-
			  track" is set	to "on"
       ---------------------------------------------------------------------
       /		  Search.
       ---------------------------------------------------------------------
       n		  Repeat search	in the forward direction.
       ---------------------------------------------------------------------
       N		  Repeat search	in the backward	direction.
       ---------------------------------------------------------------------
       m		  Toggle MRU.
       ---------------------------------------------------------------------

       g		  Toggle group nesting.
       ---------------------------------------------------------------------
       a		  All window view.
       ---------------------------------------------------------------------
       C-h or backspace	  Back out the group.
       ---------------------------------------------------------------------
       ,		  Switch numbers with the previous window.
       ---------------------------------------------------------------------
       .		  Switch numbers with the next window.
       ---------------------------------------------------------------------
       K		  Kill that window.
       ---------------------------------------------------------------------
       space or	enter	  Select that window.
       ---------------------------------------------------------------------

       The table format	can be changed with the	string and title  option,  the
       title  is displayed as table heading, while the lines are made by using
       the string setting. The default setting is "Num	Name%=Flags"  for  the
       title and "%3n %t%=%f" for the lines.  See the "STRING ESCAPES" chapter
       for more	codes (e.g. color settings).

       "Windowlist" needs a region size	of at least 10 characters wide	and  6
       characters high in order	to display.

       windows [ string	]

       Uses  the message line to display a list	of all the windows.  Each win-
       dow is listed by	number with the	name of	process	that has been  started
       in  the window (or its title); the current window is marked with	a `*';
       the previous window is marked with a `-';  all  the  windows  that  are
       "logged	in"  are  marked  with a `$'; a	background window that has re-
       ceived a	bell is	marked with a `!'; a background	window that  is	 being
       monitored  and  has  had	activity occur is marked with an `@'; a	window
       which has output	logging	turned on is marked with `(L)';	windows	 occu-
       pied  by	 other	users are marked with `&'; windows in the zombie state
       are marked with `Z'.  If	this list is too long to fit on	the terminal's
       status  line  only  the portion around the current window is displayed.
       The optional string parameter follows the "STRING ESCAPES" format.   If
       string  parameter is passed, the	output size is unlimited.  The default
       command without any parameter is	limited	to a size of 1024 bytes.

       wrap [on|off]

       Sets the	line-wrap setting for the current window.  When	 line-wrap  is
       on,  the	second consecutive printable character output at the last col-
       umn of a	line will wrap to the start of	the  following	line.	As  an
       added feature, backspace	(^H) will also wrap through the	left margin to
       the previous line.  Default is `on'. Without any	options, the state  of
       wrap is toggled.

       writebuf	[-e encoding] [filename]

       Writes  the  contents of	the paste buffer to the	specified file,	or the
       public accessible screen-exchange file if no filename is	given. This is
       thought	of  as a primitive means of communication between screen users
       on the same host. If an encoding	is specified the paste buffer  is  re-
       coded  on  the fly to match the encoding.  The filename can be set with
       the bufferfile command and defaults to "/tmp/screen-exchange".

       writelock [on|off|auto]

       In addition to access control lists, not	all users may be able to write
       to  the	same  window at	once. Per default, writelock is	in `auto' mode
       and grants exclusive input permission to	the user who is	the  first  to
       switch to the particular	window.	When he	leaves the window, other users
       may obtain the writelock	(automatically). The writelock of the  current
       window  is  disabled by the command "writelock off". If the user	issues
       the command "writelock on" he  keeps  the  exclusive  write  permission
       while switching to other	windows.

       xoff

       xon

       Insert  a  CTRL-s  / CTRL-q character to	the stdin queue	of the current
       window.

       zmodem [off|auto|catch|pass]

       zmodem sendcmd [string]

       zmodem recvcmd [string]

       Define zmodem support for  screen.  Screen  understands	two  different
       modes  when  it	detects	 a zmodem request: "pass" and "catch".	If the
       mode is set to "pass", screen will relay	all data to the	attacher until
       the end of the transmission is reached.	In "catch" mode	screen acts as
       a zmodem	endpoint and starts the	corresponding rz/sz commands.  If  the
       mode  is	 set to	"auto",	screen will use	"catch"	if the window is a tty
       (e.g. a serial line), otherwise it will use "pass".

       You can define the templates screen uses	in "catch" mode	via the	second
       and the third form.

       Note also that this is an experimental feature.

       zombie [keys[onerror]]

       Per  default screen windows are removed from the	window list as soon as
       the windows process (e.g. shell)	exits. When a string of	 two  keys  is
       specified  to  the  zombie  command,  `dead' windows will remain	in the
       list.  The kill command may be used to remove such a  window.  Pressing
       the first key in	the dead window	has the	same effect. When pressing the
       second key, screen will attempt to resurrect the	 window.  The  process
       that  was initially running in the window will be launched again. Call-
       ing zombie without parameters will clear	the zombie setting, thus  mak-
       ing windows disappear when their	process	exits.

       As  the	zombie-setting	is  manipulated	globally for all windows, this
       command should probably be called defzombie, but	it isn't.

       Optionally you can put the word "onerror" after	the  keys.  This  will
       cause  screen to	monitor	exit status of the process running in the win-
       dow. If it exits	normally ('0'),	the window disappears. Any other  exit
       value causes the	window to become a zombie.

       zombie_timeout[seconds]

       Per  default screen windows are removed from the	window list as soon as
       the windows process (e.g. shell)	exits.	If  zombie  keys  are  defined
       (compare	with above zombie command), it is possible to also set a time-
       out when	screen tries to	automatically reconnect	a dead screen window.

THE MESSAGE LINE
       Screen displays informational messages and other	diagnostics in a  mes-
       sage  line.   While this	line is	distributed to appear at the bottom of
       the screen, it can be defined to	appear at the top of the screen	during
       compilation.   If  your terminal	has a status line defined in its term-
       cap, screen will	use this for displaying	its messages, otherwise	a line
       of  the	current	screen will be temporarily overwritten and output will
       be momentarily interrupted. The message line is	automatically  removed
       after  a	few seconds delay, but it can also be removed early (on	termi-
       nals without a status line) by beginning	to type.

       The message line	facility can be	used by	an application running in  the
       current	window	by means of the	ANSI Privacy message control sequence.
       For instance, from within the shell, try	something like:

	      echo '<esc>^Hello	world from window '$WINDOW'<esc>\\'

       where '<esc>' is	an escape, '^' is a literal up-arrow, and  '\\'	 turns
       into a single backslash.

WINDOW TYPES
       Screen  provides	 three different window	types. New windows are created
       with screen's screen command (see also the entry	in chapter "CUSTOMIZA-
       TION"). The first parameter to the screen command defines which type of
       window is created. The different	window types are all special cases  of
       the  normal  type.  They	have been added	in order to allow screen to be
       used efficiently	as a console multiplexer with 100 or more windows.

       o  The normal window contains a shell  (default,	 if  no	 parameter  is
	  given)  or  any  other  system command that could be executed	from a
	  shell	(e.g.  slogin, etc...)

       o  If a tty (character special device) name (e.g. "/dev/ttya") is spec-
	  ified	 as the	first parameter, then the window is directly connected
	  to this device.  This	window	type  is  similar  to  "screen	cu  -l
	  /dev/ttya".	Read  and write	access is required on the device node,
	  an exclusive open is attempted on the	node to	 mark  the  connection
	  line	as  busy.   An	optional  parameter is allowed consisting of a
	  comma	separated list of flags	in the notation	used by	stty(1):

	  <baud_rate>
		 Usually 300, 1200, 9600 or 19200. This	 affects  transmission
		 as well as receive speed.

	  cs8 or cs7
		 Specify the transmission of eight (or seven) bits per byte.

	  ixon or -ixon
		 Enables  (or  disables) software flow-control (CTRL-S/CTRL-Q)
		 for sending data.

	  ixoff	or -ixoff
		 Enables (or disables)	software  flow-control	for  receiving
		 data.

	  istrip or -istrip
		 Clear (or keep) the eight bit in each received	byte.

	  You  may want	to specify as many of these options as applicable. Un-
	  specified options cause the terminal driver to make up the parameter
	  values of the	connection.  These values are system dependent and may
	  be in	defaults or values saved from a	previous connection.

	  For tty windows, the info command shows some of  the	modem  control
	  lines	 in  the  status  line.	These may include `RTS', `CTS',	'DTR',
	  `DSR', `CD' and more.	 This depends on the available	ioctl()'s  and
	  system  header  files	as well	as the on the physical capabilities of
	  the serial board.  Signals that  are	logical	 low  (inactive)  have
	  their	name preceded by an exclamation	mark (!), otherwise the	signal
	  is logical high (active).  Signals not supported by the hardware but
	  available to the ioctl() interface are usually shown low.

	  When	the  CLOCAL status bit is true,	the whole set of modem signals
	  is placed inside curly braces	({ and }).  When the CRTSCTS or	 TIOC-
	  SOFTCAR bit is set, the signals `CTS'	or `CD'	are shown in parenthe-
	  sis, respectively.

	  For tty windows, the command break causes the	Data transmission line
	  (TxD)	 to go low for a specified period of time. This	is expected to
	  be interpreted as break signal on the	other side.  No	data  is  sent
	  and no modem control line is changed when a break is issued.

       o  If  the  first  parameter is "//telnet", the second parameter	is ex-
	  pected to be a host name, and	an optional third parameter may	 spec-
	  ify  a TCP port number (default decimal 23).	Screen will connect to
	  a server listening on	the remote host	and use	the telnet protocol to
	  communicate with that	server.

       For telnet windows, the command info shows details about	the connection
       in square brackets ([ and ]) at the end of the status line.

	      b	     BINARY. The connection is in binary mode.

	      e	     ECHO. Local echo is disabled.

	      c	     SGA. The connection  is  in  `character  mode'  (default:
		     `line mode').

	      t	     TTYPE. The	terminal type has been requested by the	remote
		     host.  Screen sends the name "screen"  unless  instructed
		     otherwise (see also the command `term').

	      w	     NAWS.  The	 remote	 site  is  notified  about window size
		     changes.

	      f	     LFLOW. The	remote host will send  flow  control  informa-
		     tion.  (Ignored at	the moment.)

	      Additional  flags	for debugging are x, t and n (XDISPLOC,	TSPEED
	      and NEWENV).

	      For telnet windows, the command break sends the telnet code  IAC
	      BREAK (decimal 243) to the remote	host.

	      This  window  type is only available if screen was compiled with
	      the ENABLE_TELNET	option defined.

STRING ESCAPES
       Screen provides an escape mechanism to insert information like the cur-
       rent time into messages or file names. The escape character is '%' with
       one exception: inside of	a window's hardstatus '^%' ('^E') is used  in-
       stead.

       Here is the full	list of	supported escapes:

       %      the escape character itself

       E      sets %? to true if the escape character has been pressed.

       f      flags  of	 the window, see "windows" for meanings	of the various
	      flags

       F      sets %? to true if the window has	the focus

       h      hardstatus of the	window

       H      hostname of the system

       n      window number

       P      sets %? to true if the current region is in copy/paste mode

       S      session name

       s      window size

       t      window title

       u      all other	users on this window

       w      all window numbers and names. With '-' qualifier:	up to the cur-
	      rent  window; with '+' qualifier:	starting with the window after
	      the current one.

       W      all window numbers and names except the current one

       x      the executed command including arguments running in this windows

       X      the executed command without arguments running in	this windows

       ?      the part to the next '%?'	is displayed only if a '%' escape  in-
	      side the part expands to a non-empty string

       :      else part	of '%?'

       =      pad  the	string to the display's	width (like TeX's hfill). If a
	      number is	specified, pad	to  the	 percentage  of	 the  window's
	      width.   A '0' qualifier tells screen to treat the number	as ab-
	      solute position.	You can	specify	to pad relative	 to  the  last
	      absolute	pad position by	adding a '+' qualifier or to pad rela-
	      tive to the right	margin by using	'-'. The padding truncates the
	      string  if  the specified	position lies before the current posi-
	      tion. Add	the 'L'	qualifier to change this.

       <      same as '%=' but just do truncation, do not fill with spaces

       >      mark the current text position for  the  next  truncation.  When
	      screen  needs  to	do truncation, it tries	to do it in a way that
	      the marked position gets moved to	the  specified	percentage  of
	      the output area. (The area starts	from the last absolute pad po-
	      sition and ends with the position	specified  by  the  truncation
	      operator.)  The 'L' qualifier tells screen to mark the truncated
	      parts with '...'.

       {      attribute/color modifier string terminated by the	next "}"

       `      Substitute with the output of a 'backtick' command.  The	length
	      qualifier	is misused to identify one of the commands.

       The  'c'	 and 'C' escape	may be qualified with a	'0' to make screen use
       zero instead of space as	fill character.	The '0'	qualifier  also	 makes
       the  '='	 escape	use absolute positions.	The 'n'	and '='	escapes	under-
       stand a length qualifier	(e.g. '%3n'), 'D' and 'M' can be prefixed with
       'L'  to	generate long names, 'w' and 'W' also show the window flags if
       'L' is given.

       An attribute/color modifier is used to change  the  attributes  or  the
       color  settings.	 Its  format  is "[attribute modifier] [color descrip-
       tion]". The attribute modifier must be prefixed by a change type	 indi-
       cator  if  it  can  be confused with a color description. The following
       change types are	known:

       +      add the specified	set to the current attributes

       -      remove the set from the current attributes

       !      invert the set in	the current attributes

       =      change the current attributes to the specified set

       The attribute set can either be specified as a hexadecimal number or  a
       combination of the following letters:

       d      dim
       u      underline
       b      bold
       r      reverse
       s      standout
       B      blinking

       Colors are coded	either as a hexadecimal	number or two letters specify-
       ing the desired background and foreground color (in  that  order).  The
       following colors	are known:

       k      black
       r      red
       g      green
       y      yellow
       b      blue
       m      magenta
       c      cyan
       w      white
       d      default color
       .      leave color unchanged

       The  capitalized	 versions of the letter	specify	bright colors. You can
       also use	the pseudo-color 'i' to	set just the brightness	and leave  the
       color unchanged.
       A  one digit/letter color description is	treated	as foreground or back-
       ground color dependent on the current attributes: if  reverse  mode  is
       set,  the  background color is changed instead of the foreground	color.
       If you don't like this, prefix the color	with a ".". If	you  want  the
       same  behavior for two-letter color descriptions, also prefix them with
       a ".".
       As a special case, "%{-}" restores the attributes and colors that  were
       set before the last change was made (i.e., pops one level of the	color-
       change stack).

       Examples:

       "G"    set color	to bright green

       "+b r" use bold red

       "= yd" clear all	attributes, write in default  color  on	 yellow	 back-
	      ground.

       %-Lw%{= BW}%50>%n%f* %t%{-}%+Lw%<
	      The  available  windows centered at the current window and trun-
	      cated to the available width. The	current	 window	 is  displayed
	      white  on	 blue.	 This can be used with "hardstatus alwayslast-
	      line".

       %?%F%{.R.}%?%3n %t%? [%h]%?
	      The window number	and title and the window's hardstatus, if  one
	      is  set.	Also use a red background if this is the active	focus.
	      Useful for "caption string".

FLOW-CONTROL
       Each window has a flow-control setting that determines how screen deals
       with the	XON and	XOFF characters	(and perhaps the interrupt character).
       When flow-control is turned off,	screen ignores the XON and XOFF	 char-
       acters,	which  allows  the user	to send	them to	the current program by
       simply typing them (useful for the emacs	editor,	 for  instance).   The
       trade-off  is  that it will take	longer for output from a "normal" pro-
       gram to pause in	response to an XOFF.  With flow-control	turned on, XON
       and  XOFF  characters  are  used	to immediately pause the output	of the
       current window.	You can	still send these  characters  to  the  current
       program,	but you	must use the appropriate two-character screen commands
       (typically "C-a q" (xon)	and "C-a s" (xoff)).   The  xon/xoff  commands
       are  also useful	for typing C-s and C-q past a terminal that intercepts
       these characters.

       Each window has an initial flow-control value set with  either  the  -f
       option  or the "defflow"	.screenrc command. Per default the windows are
       set to automatic	flow-switching.	 It can	then be	 toggled  between  the
       three states 'fixed on',	'fixed off' and	'automatic' interactively with
       the "flow" command bound	to "C-a	f".

       The automatic flow-switching mode deals with flow control using the TI-
       OCPKT mode (like	"rlogin" does).	If the tty driver does not support TI-
       OCPKT, screen tries to find out the right mode  based  on  the  current
       setting of the application keypad - when	it is enabled, flow-control is
       turned off and visa versa.  Of course, you can still  manipulate	 flow-
       control manually	when needed.

       If  you're running with flow-control enabled and	find that pressing the
       interrupt key (usually C-c) does	not interrupt the  display  until  an-
       other  6-8  lines have scrolled by, try running screen with the "inter-
       rupt" option (add the "interrupt" flag to the "flow"  command  in  your
       .screenrc,  or use the -i command-line option).	This causes the	output
       that screen has accumulated from	the interrupted	program	to be flushed.
       One  disadvantage  is  that  the	virtual	terminal's memory contains the
       non-flushed version of the output, which	in rare	cases can cause	 minor
       inaccuracies in the output.  For	example, if you	switch screens and re-
       turn, or	update the screen with "C-a l" you would see  the  version  of
       the  output  you	would have gotten without "interrupt" being on.	 Also,
       you might need to turn off flow-control (or use auto-flow mode to  turn
       it  off	automatically) when running a program that expects you to type
       the interrupt character as input, as it is possible  to	interrupt  the
       output of the virtual terminal to your physical terminal	when flow-con-
       trol is enabled.	 If this happens, a simple refresh of the screen  with
       "C-a  l"	will restore it.  Give each mode a try,	and use	whichever mode
       you find	more comfortable.

TITLES (naming windows)
       You can customize each window's name in the window display (viewed with
       the "windows" command (C-a w)) by setting it with one of	the title com-
       mands.  Normally	the name displayed is the actual command name  of  the
       program created in the window.  However,	it is sometimes	useful to dis-
       tinguish	various	programs of the	same name or to	change	the  name  on-
       the-fly to reflect the current state of the window.

       The default name	for all	shell windows can be set with the "shelltitle"
       command in the .screenrc	file, while all	other windows are created with
       a "screen" command and thus can have their name set with	the -t option.
       Interactively,	 there	  is	the    title-string    escape-sequence
       (<esc>kname<esc>\)  and the "title" command (C-a	A).  The former	can be
       output from an application to control the window's name under  software
       control,	 and  the  latter  will	prompt for a name when typed.  You can
       also bind pre-defined names to keys with	the  "title"  command  to  set
       things  quickly	without	 prompting.  Changing title by this escape se-
       quence can be controlled	by defdynamictitle and dynamictitle commands.

       Finally,	screen has a shell-specific heuristic that is enabled by  set-
       ting  the  window's  name to "search|name" and arranging	to have	a null
       title escape-sequence output as a part of your prompt.  The search por-
       tion  specifies	an end-of-prompt search	string,	while the name portion
       specifies the default shell name	for the	window.	 If the	name ends in a
       `:'  screen will	add what it believes to	be the current command running
       in the window to	the end	of the window's	shell name (e.g.  "name:cmd").
       Otherwise  the  current command name supersedes the shell name while it
       is running.

       Here's how it works:  you must modify your shell	 prompt	 to  output  a
       null  title-escape-sequence  (<esc>k<esc>\)  as	a part of your prompt.
       The last	part of	your prompt must be the	same as	the string you	speci-
       fied  for the search portion of the title.  Once	this is	set up,	screen
       will use	the title-escape-sequence to clear the previous	 command  name
       and  get	 ready for the next command.  Then, when a newline is received
       from the	shell, a search	is made	for the	end of the prompt.  If	found,
       it  will	grab the first word after the matched string and use it	as the
       command name.  If the command name begins with either '!', '%', or  '^'
       screen  will  use  the  first  word on the following line (if found) in
       preference to the just-found name.  This	helps  csh  users  get	better
       command names when using	job control or history recall commands.

       Here's some .screenrc examples:

	      screen -t	top 2 nice top

       Adding  this line to your .screenrc would start a nice-d	version	of the
       "top" command in	window 2 named "top" rather than "nice".

		       shelltitle '> |csh'
		       screen 1

       These commands would start a shell with the given shelltitle.  The  ti-
       tle  specified  is  an  auto-title that would expect the	prompt and the
       typed command to	look something like the	following:

	      /usr/joe/src/dir>	trn

       (it looks after the '> '	for the	 command  name).   The	window	status
       would  show the name "trn" while	the command was	running, and revert to
       "csh" upon completion.

	      bind R screen -t '% |root:' su

       Having this command in your .screenrc would bind	the key	sequence  "C-a
       R"  to the "su" command and give	it an auto-title name of "root:".  For
       this auto-title to work,	the screen could look something	like this:

		       % !em
		       emacs file.c

       Here the	user typed the csh history command "!em" which ran the	previ-
       ously   entered	 "emacs"   command.   The  window  status  would  show
       "root:emacs" during the execution of the	command, and revert to	simply
       "root:" at its completion.

		       bind o title
		       bind E title ""
		       bind u title (unknown)

       The  first  binding  doesn't have any arguments,	so it would prompt you
       for a title when	you type "C-a o".  The second binding would  clear  an
       auto-title's  current setting (C-a E).  The third binding would set the
       current window's	title to "(unknown)" (C-a u).

       One thing to keep in mind when adding a null  title-escape-sequence  to
       your  prompt  is	that some shells (like the csh)	count all the non-con-
       trol characters as part of the prompt's	length.	  If  these  invisible
       characters  aren't a multiple of	8 then backspacing over	a tab will re-
       sult in an incorrect display.  One way to get around this is to	use  a
       prompt like this:

	      set prompt='^[[0000m^[k^[\% '

       The escape-sequence "<esc>[0000m" not only normalizes the character at-
       tributes, but all the zeros round the length of the  invisible  charac-
       ters  up	 to  8.	  Bash users will probably want	to echo	the escape se-
       quence in the PROMPT_COMMAND:

	      PROMPT_COMMAND='printf "\033k\033\134"'

       (I used "\134" to output	a `\' because of a bug in bash v1.04).

THE VIRTUAL TERMINAL
       Each window in a	screen session emulates	a VT100	 terminal,  with  some
       extra  functions	added. The VT100 emulator is hard-coded, no other ter-
       minal types can be emulated.
       Usually screen tries to emulate as much of the VT100/ANSI  standard  as
       possible.  But  if your terminal	lacks certain capabilities, the	emula-
       tion may	not be complete. In these cases	screen has to tell the	appli-
       cations	that  some  of the features are	missing. This is no problem on
       machines	using termcap, because screen can use the $TERMCAP variable to
       customize the standard screen termcap.

       But if you do a rlogin on another machine or your machine supports only
       terminfo	this method fails. Because of this, screen  offers  a  way  to
       deal with these cases.  Here is how it works:

       When  screen  tries  to figure out a terminal name for itself, it first
       looks for an entry named	"screen.<term>", where <term> is the  contents
       of your $TERM variable.	If no such entry exists, screen	tries "screen"
       (or "screen-w" if the terminal is wide (132 cols	or  more)).   If  even
       this entry cannot be found, "vt100" is used as a	substitute.

       The idea	is that	if you have a terminal which doesn't support an	impor-
       tant feature (e.g. delete char or clear to EOS) you  can	 build	a  new
       termcap/terminfo	 entry for screen (named "screen.<dumbterm>") in which
       this capability has been	disabled. If this entry	is installed  on  your
       machines	 you  are able to do a rlogin and still	keep the correct term-
       cap/terminfo entry.  The	terminal name is put in	the $TERM variable  of
       all new windows.	 Screen	also sets the $TERMCAP variable	reflecting the
       capabilities of the virtual terminal emulated. Notice that, however, on
       machines	using the terminfo database this variable has no effect.  Fur-
       thermore, the variable $WINDOW is set to	the window number of each win-
       dow.

       The  actual  set	 of capabilities supported by the virtual terminal de-
       pends on	the capabilities supported by the physical terminal.  If,  for
       instance,  the  physical	 terminal  does	 not  support underscore mode,
       screen does not put the `us' and	`ue' capabilities  into	 the  window's
       $TERMCAP	variable, accordingly.	However, a minimum number of capabili-
       ties must be supported by a terminal in order  to  run  screen;	namely
       scrolling,  clear  screen,  and	direct cursor addressing (in addition,
       screen does not run on hardcopy terminals or on	terminals  that	 over-
       strike).

       Also,  you can customize	the $TERMCAP value used	by screen by using the
       "termcap" .screenrc command, or by  defining  the  variable  $SCREENCAP
       prior to	startup.  When the latter is defined, its value	will be	copied
       verbatim	into each window's $TERMCAP variable.  This can	either be  the
       full  terminal  definition,  or	a filename where the terminal "screen"
       (and/or "screen-w") is defined.

       Note that screen	honors the "terminfo" .screenrc	command	if the	system
       uses the	terminfo database rather than termcap.

       When  the  boolean  `G0'	capability is present in the termcap entry for
       the terminal on which screen has	been called, the terminal emulation of
       screen supports multiple	character sets.	 This allows an	application to
       make use	of, for	instance, the VT100 graphics character set or national
       character sets.	The following control functions	from ISO 2022 are sup-
       ported: lock shift G0 (SI), lock	shift G1 (SO),	lock  shift  G2,  lock
       shift  G3, single shift G2, and single shift G3.	 When a	virtual	termi-
       nal is created or reset,	the ASCII character set	is  designated	as  G0
       through	G3.  When the `G0' capability is present, screen evaluates the
       capabilities `S0', `E0',	and `C0' if present. `S0' is the sequence  the
       terminal	 uses  to  enable  and start the graphics character set	rather
       than SI.	 `E0' is the corresponding replacement for SO.	`C0'  gives  a
       character  by  character	 translation  string that is used during semi-
       graphics	mode. This string is built like	the `acsc'  terminfo  capabil-
       ity.

       When the	`po' and `pf' capabilities are present in the terminal's term-
       cap entry, applications running in a screen window can send  output  to
       the printer port	of the terminal.  This allows a	user to	have an	appli-
       cation in one window sending output to a	printer	connected to the  ter-
       minal,  while  all  other windows are still active (the printer port is
       enabled and disabled again for each chunk of output).   As  a  side-ef-
       fect,  programs	running	 in  different	windows	can send output	to the
       printer simultaneously.	Data sent to the printer is not	 displayed  in
       the window.  The	info command displays a	line starting `PRIN' while the
       printer is active.

       Screen maintains	a hardstatus line for every window. If a  window  gets
       selected,  the  display's  hardstatus will be updated to	match the win-
       dow's hardstatus	line. If the display has no hardstatus the  line  will
       be  displayed as	a standard screen message.  The	hardstatus line	can be
       changed	 with	the   ANSI   Application   Program   Command	(APC):
       "ESC_<string>ESC\".  As	a  convenience	for  xterm  users the sequence
       "ESC]0..2;<string>^G" is	also accepted.

       Some capabilities are only put into the $TERMCAP	variable of  the  vir-
       tual  terminal  if  they	can be efficiently implemented by the physical
       terminal.  For instance,	`dl' (delete line) is only put into the	$TERM-
       CAP  variable  if  the  terminal	 supports either delete	line itself or
       scrolling regions. Note that this may provoke confusion,	when the  ses-
       sion  is	 reattached  on	a different terminal, as the value of $TERMCAP
       cannot be modified by parent processes.

       The "alternate screen" capability is not	enabled	by default.   Set  the
       altscreen .screenrc command to enable it.

       The  following  is  a  list  of control sequences recognized by screen.
       "(V)" and "(A)" indicate	VT100-specific and ANSI- or ISO-specific func-
       tions, respectively.

       ESC E			  Next Line

       ESC D			  Index

       ESC M			  Reverse Index

       ESC H			  Horizontal Tab Set

       ESC Z			  Send VT100 Identification String

       ESC 7		     (V)  Save Cursor and Attributes

       ESC 8		     (V)  Restore Cursor and Attributes

       ESC [s		     (A)  Save Cursor and Attributes

       ESC [u		     (A)  Restore Cursor and Attributes

       ESC c			  Reset	to Initial State

       ESC g			  Visual Bell

       ESC Pn p			  Cursor Visibility (97801)

				  Pn = 6		     Invisible

				  Pn = 7		     Visible

       ESC =		     (V)  Application Keypad Mode

       ESC >		     (V)  Numeric Keypad Mode

       ESC # 8		     (V)  Fill Screen with E's

       ESC \		     (A)  String Terminator

       ESC ^		     (A)  Privacy Message String (Message Line)

       ESC !			  Global Message String	(Message Line)

       ESC k			  A.k.a. Definition String

       ESC P		     (A)  Device Control String.  Outputs a string di-
				  rectly to the	host terminal  without	inter-
				  pretation.

       ESC _		     (A)  Application Program Command (Hardstatus)

       ESC ] 0 ; string	^G   (A)  Operating  System Command (Hardstatus, xterm
				  title	hack)

       ESC ] 83	; cmd ^G     (A)  Execute screen command. This only  works  if
				  multi-user  support is compiled into screen.
				  The pseudo-user ":window:" is	used to	 check
				  the  access  control list. Use "addacl :win-
				  dow: -rwx #?"	 to  create  a	user  with  no
				  rights and allow only	the needed commands.

       Control-N	     (A)  Lock Shift G1	(SO)

       Control-O	     (A)  Lock Shift G0	(SI)

       ESC n		     (A)  Lock Shift G2

       ESC o		     (A)  Lock Shift G3

       ESC N		     (A)  Single Shift G2

       ESC O		     (A)  Single Shift G3

       ESC ( Pcs	     (A)  Designate character set as G0

       ESC ) Pcs	     (A)  Designate character set as G1

       ESC * Pcs	     (A)  Designate character set as G2

       ESC + Pcs	     (A)  Designate character set as G3

       ESC [ Pn	; Pn H		  Direct Cursor	Addressing

       ESC [ Pn	; Pn f		  same as above

       ESC [ Pn	J		  Erase	in Display

				  Pn = None or 0	     From   Cursor  to
							     End of Screen

				  Pn = 1		     From Beginning of
							     Screen to Cursor

				  Pn = 2		     Entire Screen

       ESC [ Pn	K		  Erase	in Line

				  Pn = None or 0	     From   Cursor  to
							     End of Line

				  Pn = 1		     From Beginning of
							     Line to Cursor

				  Pn = 2		     Entire Line

       ESC [ Pn	X		  Erase	character

       ESC [ Pn	A		  Cursor Up

       ESC [ Pn	B		  Cursor Down

       ESC [ Pn	C		  Cursor Right

       ESC [ Pn	D		  Cursor Left

       ESC [ Pn	E		  Cursor next line

       ESC [ Pn	F		  Cursor previous line

       ESC [ Pn	G		  Cursor horizontal position

       ESC [ Pn	`		  same as above

       ESC [ Pn	d		  Cursor vertical position

       ESC [ Ps	;...; Ps m	  Select Graphic Rendition

				  Ps = None or 0	     Default Rendition

				  Ps = 1		     Bold

				  Ps = 2		(A)  Faint

				  Ps = 3		(A)  Standout	  Mode
							     (ANSI:	Itali-
							     cized)

				  Ps = 4		     Underlined

				  Ps = 5		     Blinking

				  Ps = 7		     Negative Image

				  Ps = 22		(A)  Normal Intensity

				  Ps = 23		(A)  Standout Mode off
							     (ANSI: Italicized
							     off)

				  Ps = 24		(A)  Not Underlined

				  Ps = 25		(A)  Not Blinking

				  Ps = 27		(A)  Positive Image

				  Ps = 30		(A)  Foreground	Black

				  Ps = 31		(A)  Foreground	Red

				  Ps = 32		(A)  Foreground	Green

				  Ps = 33		(A)  Foreground	Yellow

				  Ps = 34		(A)  Foreground	Blue

				  Ps = 35		(A)  Foreground	   Ma-
							     genta

				  Ps = 36		(A)  Foreground	Cyan

				  Ps = 37		(A)  Foreground	White

				  Ps = 39		(A)  Foreground	   De-
							     fault

				  Ps = 40		(A)  Background	Black

				  Ps = ...

				  Ps = 49		(A)  Background	   De-
							     fault

       ESC [ Pn	g		  Tab Clear

				  Pn = None or 0	     Clear Tab at Cur-
							     rent Position

				  Pn = 3		     Clear All Tabs

       ESC [ Pn	; Pn r	     (V)  Set Scrolling	Region

       ESC [ Pn	I	     (A)  Horizontal Tab

       ESC [ Pn	Z	     (A)  Backward Tab

       ESC [ Pn	L	     (A)  Insert Line

       ESC [ Pn	M	     (A)  Delete Line

       ESC [ Pn	@	     (A)  Insert Character

       ESC [ Pn	P	     (A)  Delete Character

       ESC [ Pn	S		  Scroll Scrolling Region Up

       ESC [ Pn	T		  Scroll Scrolling Region Down

       ESC [ Pn	^		  same as above

       ESC [ Ps	;...; Ps h	  Set Mode

       ESC [ Ps	;...; Ps l	  Reset	Mode

				  Ps = 4		(A)  Insert Mode

				  Ps = 20		(A)  Automatic	 Line-
							     feed Mode

				  Ps = 34		     Normal	Cursor
							     Visibility

				  Ps = ?1		(V)  Application  Cur-
							     sor Keys

				  Ps = ?3		(V)  Change   Terminal
							     Width to 132 col-
							     umns

				  Ps = ?5		(V)  Reverse Video

				  Ps = ?6		(V)  Origin Mode

				  Ps = ?7		(V)  Wrap Mode

				  Ps = ?9		     X10 mouse	track-
							     ing

				  Ps = ?25		(V)  Visible Cursor

				  Ps = ?47		     Alternate	Screen
							     (old xterm	code)

				  Ps = ?1000		(V)  VT200	 mouse
							     tracking

				  Ps = ?1047		     Alternate	Screen
							     (new xterm	code)

				  Ps = ?1049		     Alternate	Screen
							     (new xterm	code)

       ESC [ 5 i	     (A)  Start	relay to printer (ANSI Media Copy)

       ESC [ 4 i	     (A)  Stop relay to	printer	(ANSI Media Copy)

       ESC [ 8 ; Ph ; Pw t	  Resize  the  window  to  `Ph'	lines and `Pw'
				  columns (SunView special)

       ESC [ c			  Send VT100 Identification String

       ESC [ x			  Send Terminal	Parameter Report

       ESC [ > c		  Send	VT220  Secondary   Device   Attributes
				  String

       ESC [ 6 n		  Send Cursor Position Report

INPUT TRANSLATION
       In  order  to do	a full VT100 emulation screen has to detect that a se-
       quence of characters in the input stream	was generated by a keypress on
       the  user's keyboard and	insert the VT100 style escape sequence.	Screen
       has a very flexible way of doing	this by	making it possible to map  ar-
       bitrary	commands  on  arbitrary	 sequences of characters. For standard
       VT100 emulation the command will	always insert a	string	in  the	 input
       buffer  of  the	window	(see also command stuff	in the command table).
       Because the sequences generated by a keypress can change	after a	 reat-
       tach from a different terminal type, it is possible to bind commands to
       the termcap name	of the keys.  Screen will insert the  correct  binding
       after each reattach. See	the bindkey command for	further	details	on the
       syntax and examples.

       Here is the table of the	default	key bindings. The fourth is what  com-
       mand is executed	if the keyboard	is switched into application mode.

       +----------------+--------------+----------+----------+
       |Key name	| Termcap name | Command  | App	mode |
       +----------------+--------------+----------+----------+
       |Cursor up	| ku	       | \033[A	  | \033OA   |
       +----------------+--------------+----------+----------+
       |Cursor down	| kd	       | \033[B	  | \033OB   |
       +----------------+--------------+----------+----------+
       |Cursor right	| kr	       | \033[C	  | \033OC   |
       +----------------+--------------+----------+----------+
       |Cursor left	| kl	       | \033[D	  | \033OD   |
       +----------------+--------------+----------+----------+
       |Function key 0	| k0	       | \033[10~ |	     |
       +----------------+--------------+----------+----------+
       |Function key 1	| k1	       | \033OP	  |	     |
       +----------------+--------------+----------+----------+
       |Function key 2	| k2	       | \033OQ	  |	     |
       +----------------+--------------+----------+----------+
       |Function key 3	| k3	       | \033OR	  |	     |
       +----------------+--------------+----------+----------+
       |Function key 4	| k4	       | \033OS	  |	     |
       +----------------+--------------+----------+----------+
       |Function key 5	| k5	       | \033[15~ |	     |
       +----------------+--------------+----------+----------+
       |Function key 6	| k6	       | \033[17~ |	     |
       +----------------+--------------+----------+----------+
       |Function key 7	| k7	       | \033[18~ |	     |
       +----------------+--------------+----------+----------+
       |Function key 8	| k8	       | \033[19~ |	     |
       +----------------+--------------+----------+----------+
       |Function key 9	| k9	       | \033[20~ |	     |
       +----------------+--------------+----------+----------+
       |Function key 10	| k;	       | \033[21~ |	     |
       +----------------+--------------+----------+----------+
       |Function key 11	| F1	       | \033[23~ |	     |
       +----------------+--------------+----------+----------+
       |Function key 12	| F2	       | \033[24~ |	     |
       +----------------+--------------+----------+----------+
       |Home		| kh	       | \033[1~  |	     |
       +----------------+--------------+----------+----------+
       |End		| kH	       | \033[4~  |	     |
       +----------------+--------------+----------+----------+
       |Insert		| kI	       | \033[2~  |	     |
       +----------------+--------------+----------+----------+
       |Delete		| kD	       | \033[3~  |	     |
       +----------------+--------------+----------+----------+
       |Page up		| kP	       | \033[5~  |	     |
       +----------------+--------------+----------+----------+
       |Page down	| kN	       | \033[6~  |	     |
       +----------------+--------------+----------+----------+
       |Keypad 0	| f0	       | 0	  | \033Op   |
       +----------------+--------------+----------+----------+
       |Keypad 1	| f1	       | 1	  | \033Oq   |
       +----------------+--------------+----------+----------+
       |Keypad 2	| f2	       | 2	  | \033Or   |
       +----------------+--------------+----------+----------+
       |Keypad 3	| f3	       | 3	  | \033Os   |
       +----------------+--------------+----------+----------+
       |Keypad 4	| f4	       | 4	  | \033Ot   |
       +----------------+--------------+----------+----------+
       |Keypad 5	| f5	       | 5	  | \033Ou   |
       +----------------+--------------+----------+----------+
       |Keypad 6	| f6	       | 6	  | \033Ov   |
       +----------------+--------------+----------+----------+
       |Keypad 7	| f7	       | 7	  | \033Ow   |
       +----------------+--------------+----------+----------+
       |Keypad 8	| f8	       | 8	  | \033Ox   |
       +----------------+--------------+----------+----------+
       |Keypad 9	| f9	       | 9	  | \033Oy   |
       +----------------+--------------+----------+----------+
       |Keypad +	| f+	       | +	  | \033Ok   |
       +----------------+--------------+----------+----------+
       |Keypad -	| f-	       | -	  | \033Om   |
       +----------------+--------------+----------+----------+
       |Keypad *	| f*	       | *	  | \033Oj   |
       +----------------+--------------+----------+----------+
       |Keypad /	| f/	       | /	  | \033Oo   |
       +----------------+--------------+----------+----------+
       |Keypad =	| fq	       | =	  | \033OX   |
       +----------------+--------------+----------+----------+
       |Keypad .	| f.	       | .	  | \033On   |
       +----------------+--------------+----------+----------+
       |Keypad ,	| f,	       | ,	  | \033Ol   |
       +----------------+--------------+----------+----------+
       |Keypad enter	| fe	       | \015	  | \033OM   |
       +----------------+--------------+----------+----------+

SPECIAL	TERMINAL CAPABILITIES
       The following table describes all terminal capabilities that are	recog-
       nized by	screen and are not in the termcap(5) manual.   You  can	 place
       these  capabilities  in your termcap entries (in	`/etc/termcap')	or use
       them with the commands `termcap', `terminfo' and	`termcapinfo' in  your
       screenrc	files. It is often not possible	to place these capabilities in
       the terminfo database.

       LP   (bool)  Terminal has VT100 style margins (`magic  margins').  Note
		    that  this	capability is obsolete because screen uses the
		    standard 'xn' instead.

       Z0   (str)   Change width to 132	columns.

       Z1   (str)   Change width to 80 columns.

       WS   (str)   Resize display. This capability has	the desired width  and
		    height as arguments. SunView(tm) example: '\E[8;%d;%dt'.

       NF   (bool)  Terminal  doesn't need flow	control. Send ^S and ^Q	direct
		    to the application.	Same as	'flow off'.  The  opposite  of
		    this capability is 'nx'.

       G0   (bool)  Terminal can deal with ISO 2022 font selection sequences.

       S0   (str)   Switch  charset  'G0' to the specified charset. Default is
		    '\E(%.'.

       E0   (str)   Switch charset 'G0'	back to	standard charset.  Default  is
		    '\E(B'.

       C0   (str)   Use	the string as a	conversion table for font '0'. See the
		    'ac' capability for	more details.

       CS   (str)   Switch cursor-keys to application mode.

       CE   (str)   Switch cursor-keys back to normal mode.

       AN   (bool)  Turn on autonuke. See the 'autonuke' command for more  de-
		    tails.

       OL   (num)   Set	 the  output buffer limit. See the 'obuflimit' command
		    for	more details.

       KJ   (str)   Set	the encoding of	the terminal. See the 'encoding'  com-
		    mand for valid encodings.

       AF   (str)   Change  character foreground color in an ANSI conform way.
		    This capability will almost	always	be  set	 to  '\E[3%dm'
		    ('\E[3%p1%dm' on terminfo machines).

       AB   (str)   Same as 'AF', but change background	color.

       AX   (bool)  Does  understand  ANSI  set	 default fg/bg color (\E[39m /
		    \E[49m).

       XC   (str)   Describe a translation of characters to strings  depending
		    on	the current font. More details follow in the next sec-
		    tion.

       XT   (bool)  Terminal understands special xterm sequences  (OSC,	 mouse
		    tracking).

       C8   (bool)  Terminal needs bold	to display high-intensity colors (e.g.
		    Eterm).

       TF   (bool)  Add	missing	capabilities to	the termcap/info  entry.  (Set
		    by default).

CHARACTER TRANSLATION
       Screen  has  a  powerful	mechanism to translate characters to arbitrary
       strings depending on the	current	font and terminal type.	 Use this fea-
       ture  if	 you  want  to	work with a common standard character set (say
       ISO8851-latin1) even on terminals that scatter the more unusual charac-
       ters over several national language font	pages.

       Syntax:
	   XC=_charset-mapping_{,,_charset-mapping_}
	   _charset-mapping_ :=	_designator__template_{,_mapping_}
	   _mapping_ :=	_char-to-be-mapped__template-arg_

       The things in braces may	be repeated any	number of times.

       A  _charset-mapping_ tells screen how to	map characters in font _desig-
       nator_ ('B': Ascii, 'A':	UK, 'K':  German,  etc.)   to  strings.	 Every
       _mapping_  describes  to	 what string a single character	will be	trans-
       lated. A	template mechanism is used, as most of the time	the codes have
       a  lot  in  common  (for	 example strings to switch to and from another
       charset). Each occurrence of '%'	in _template_  gets  substituted  with
       the  _template-arg_  specified  together	 with  the  character. If your
       strings are not similar at all, then use	'%' as a  template  and	 place
       the  full  string  in  _template-arg_. A	quoting	mechanism was added to
       make it possible	to use a real '%'. The '\' character quotes  the  spe-
       cial characters '\', '%', and ','.

       Here is an example:

	   termcap hp700 'XC=B\E(K%\E(B,\304[,\326\\\\,\334]'

       This  tells  screen how to translate ISOlatin1 (charset 'B') upper case
       umlaut characters on a hp700 terminal that has a	German charset.	'\304'
       gets  translated	 to  '\E(K[\E(B'  and so on.  Note that	this line gets
       parsed *three* times before the internal	lookup table is	built,	there-
       fore a lot of quoting is	needed to create a single '\'.

       Another	extension  was	added  to  allow  more emulation: If a mapping
       translates the unquoted '%' char, it will be sent to the	terminal when-
       ever screen switches to the corresponding _designator_. In this special
       case the	template is assumed to be just '%' because the charset	switch
       sequence	and the	character mappings normally haven't much in common.

       This example shows one use of the extension:

	   termcap xterm 'XC=K%,%\E(B,[\304,\\\\\326,]\334'

       Here,  a	 part of the German ('K') charset is emulated on an xterm.  If
       screen has to change to the 'K' charset,	'\E(B' will  be	 sent  to  the
       terminal,  i.e. the ASCII charset is used instead. The template is just
       '%', so the mapping is straightforward: '[' to '\304', '\'  to  '\326',
       and ']' to '\334'.

ENVIRONMENT
       COLUMNS	      Number of	columns	on the terminal	(overrides termcap en-
		      try).
       HOME	      Directory	in which to look for .screenrc.
       LINES	      Number of	lines on the terminal (overrides  termcap  en-
		      try).
       LOCKPRG	      Screen lock program.
       NETHACKOPTIONS Turns on nethack option.
       PATH	      Used for locating	programs to run.
       SCREENCAP      For customizing a	terminal's TERMCAP value.
       SCREENDIR      Alternate	socket directory.
       SCREENRC	      Alternate	user screenrc file.
       SHELL	      Default  shell  program  for  opening  windows  (default
		      "/bin/sh").  See also "shell" .screenrc command.
       STY	      Alternate	socket name.
       SYSSCREENRC    Alternate	system screenrc	file.
       TERM	      Terminal name.
       TERMCAP	      Terminal description.
       WINDOW	      Window number of a window	(at creation time).

FILES
       .../screen-4.?.??/etc/screenrc
       .../screen-4.?.??/etc/etcscreenrc Examples in the  screen  distribution
					 package  for  private and global ini-
					 tialization files.
       $SYSSCREENRC
       /usr/local/etc/screenrc		 screen	initialization commands
       $SCREENRC
       $HOME/.screenrc			 Read in after /usr/local/etc/screenrc
       $SCREENDIR/S-<login>
       /local/screens/S-<login>		 Socket	directories (default)
       /usr/tmp/screens/S-<login>	 Alternate socket directories.
       <socket directory>/.termcap	 Written by the	"termcap" output func-
					 tion
       /usr/tmp/screens/screen-exchange	 or
       /tmp/screen-exchange		 screen	  `interprocess	 communication
					 buffer'
       hardcopy.[0-9]			 Screen	images created by the hardcopy
					 function
       screenlog.[0-9]			 Output	 log  files created by the log
					 function
       /usr/lib/terminfo/?/*		 or
       /etc/termcap			 Terminal capability databases
       /etc/utmp			 Login records
       $LOCKPRG				 Program that locks a terminal.

SEE ALSO
       termcap(5), utmp(5), vi(1), captoinfo(1), tic(1)

AUTHORS
       Originally created by Oliver Laumann. For a long	 time  maintained  and
       developed by Juergen Weigert, Michael Schroeder,	Micah Cowan and	Sadrul
       Habib Chowdhury.	Since 2015 maintained and developed by Amadeusz	 Slaw-
       inski  <amade@asmblr.net>  and Alexander	Naumov <alexander_naumov@open-
       suse.org>.

COPYLEFT
       Copyright (c) 2018-2020
	    Alexander Naumov <alexander_naumov@opensuse.org>
	    Amadeusz Slawinski <amade@asmblr.net>
       Copyright (c) 2015-2017
	    Juergen Weigert <jnweiger@immd4.informatik.uni-erlangen.de>
	    Alexander Naumov <alexander_naumov@opensuse.org>
	    Amadeusz Slawinski <amade@asmblr.net>
       Copyright (c) 2010-2015
	    Juergen Weigert <jnweiger@immd4.informatik.uni-erlangen.de>
	    Sadrul Habib Chowdhury <sadrul@users.sourceforge.net>
       Copyright (c) 2008, 2009
	    Juergen Weigert <jnweiger@immd4.informatik.uni-erlangen.de>
	    Michael Schroeder <mlschroe@immd4.informatik.uni-erlangen.de>
	    Micah Cowan	<micah@cowan.name>
	    Sadrul Habib Chowdhury <sadrul@users.sourceforge.net>
       Copyright (C) 1993-2003
	    Juergen Weigert <jnweiger@immd4.informatik.uni-erlangen.de>
	    Michael Schroeder <mlschroe@immd4.informatik.uni-erlangen.de>
       Copyright (C) 1987 Oliver Laumann
       This program is free software; you can redistribute it and/or modify it
       under  the  terms of the	GNU General Public License as published	by the
       Free Software Foundation; either	version	3, or  (at  your  option)  any
       later version.
       This  program  is  distributed  in the hope that	it will	be useful, but
       WITHOUT ANY  WARRANTY;  without	even  the  implied  warranty  of  MER-
       CHANTABILITY  or	FITNESS	FOR A PARTICULAR PURPOSE.  See the GNU General
       Public License for more details.
       You should have received	a copy of the GNU General Public License along
       with  this  program  (see  the file COPYING); if	not, write to the Free
       Software	Foundation, Inc., 59 Temple Place  -  Suite  330,  Boston,  MA
       02111-1307, USA

CONTRIBUTORS
       Maarten ter Huurne <maarten@treewalker.org>,
       Jussi Kukkonen <jussi.kukkonen@intel.com>,
       Eric S. Raymond <esr@thyrsus.com>,
       Thomas Renninger	<treen@suse.com>,
       Axel Beckert <abe@deuxchevaux.org>,
       Ken Beal	<kbeal@amber.ssd.csd.harris.com>,
       Rudolf Koenig <rfkoenig@immd4.informatik.uni-erlangen.de>,
       Toerless	Eckert <eckert@immd4.informatik.uni-erlangen.de>,
       Wayne Davison <davison@borland.com>,
       Patrick Wolfe <pat@kai.com, kailand!pat>,
       Bart Schaefer <schaefer@cse.ogi.edu>,
       Nathan Glasser <nathan@brokaw.lcs.mit.edu>,
       Larry W.	Virden <lvirden@cas.org>,
       Howard Chu <hyc@hanauma.jpl.nasa.gov>,
       Tim MacKenzie <tym@dibbler.cs.monash.edu.au>,
       Markku Jarvinen <mta@{cc,cs,ee}.tut.fi>,
       Marc Boucher <marc@CAM.ORG>,
       Doug Siebert <dsiebert@isca.uiowa.edu>,
       Ken Stillson <stillson@tsfsrv.mitre.org>,
       Ian Frechett <frechett@spot.Colorado.EDU>,
       Brian Koehmstedt	<bpk@gnu.ai.mit.edu>,
       Don Smith <djs6015@ultb.isc.rit.edu>,
       Frank van der Linden <vdlinden@fwi.uva.nl>,
       Martin Schweikert <schweik@cpp.ob.open.de>,
       David Vrona <dave@sashimi.lcu.com>,
       E. Tye McQueen <tye%spillman.UUCP@uunet.uu.net>,
       Matthew Green <mrg@eterna.com.au>,
       Christopher Williams <cgw@pobox.com>,
       Matt Mosley <mattm@access.digex.net>,
       Gregory Neil Shapiro <gshapiro@wpi.WPI.EDU>,
       Johannes	Zellner	<johannes@zellner.org>,
       Pablo Averbuj <pablo@averbuj.com>.

AVAILABILITY
       The  latest official release of screen available	via anonymous ftp from
       ftp.gnu.org/gnu/screen/ or any other GNU	distribution  site.  The  home
       site  of	 screen	 is  savannah.gnu.org/projects/screen/.	If you want to
       help, send a note to screen-devel@gnu.org.

BUGS
       o  `dm' (delete mode) and `xs' are not handled correctly	(they are  ig-
	  nored). `xn' is treated as a magic-margin indicator.

       o  Screen has no	clue about double-high or double-wide characters.  But
	  this is the only area	where vttest is	allowed	to fail.

       o  It is	not possible to	change the environment variable	$TERMCAP  when
	  reattaching under a different	terminal type.

       o  The  support of terminfo based systems is very limited. Adding extra
	  capabilities to $TERMCAP may not have	any effects.

       o  Screen does not make use of hardware tabs.

       o  Screen must be installed as set-uid with owner root on most  systems
	  in  order to be able to correctly change the owner of	the tty	device
	  file for each	window.	 Special permission may	also  be  required  to
	  write	the file "/etc/utmp".

       o  Entries  in  "/etc/utmp"  are	not removed when screen	is killed with
	  SIGKILL.  This will cause some programs (like	"w" or "rwho") to  ad-
	  vertise that a user is logged	on who really isn't.

       o  Screen may give a strange warning when your tty has no utmp entry.

       o  When the modem line was hung up, screen may not automatically	detach
	  (or quit) unless the device driver is	configured to  send  a	HANGUP
	  signal.   To	detach	a screen session use the -D or -d command line
	  option.

       o  If a password	is set,	the command line options -d and	-D  still  de-
	  tach a session without asking.

       o  Both	"breaktype"  and  "defbreaktype"  change  the break generating
	  method used by all terminal devices. The first should	change a  win-
	  dow  specific	 setting,  where the latter should change only the de-
	  fault	for new	windows.

       o  When attaching to a multiuser	session, the user's .screenrc file  is
	  not  sourced.	 Each  user's personal settings	have to	be included in
	  the .screenrc	file from which	the session is booted, or have	to  be
	  changed manually.

       o  A weird imagination is most useful to	gain full advantage of all the
	  features.

       o  Send bug-reports, fixes, enhancements, t-shirts, money, beer & pizza
	  to screen-devel@gnu.org.

4th Berkeley Distribution	   Feb 2020			     SCREEN(1)

NAME | SYNOPSIS | DESCRIPTION | GETTING STARTED | COMMAND-LINE OPTIONS | DEFAULT KEY BINDINGS | CUSTOMIZATION | THE MESSAGE LINE | WINDOW TYPES | STRING ESCAPES | FLOW-CONTROL | TITLES (naming windows) | THE VIRTUAL TERMINAL | INPUT TRANSLATION | SPECIAL TERMINAL CAPABILITIES | CHARACTER TRANSLATION | ENVIRONMENT | FILES | SEE ALSO | AUTHORS | COPYLEFT | CONTRIBUTORS | AVAILABILITY | BUGS

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