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cu(1)									 cu(1)

NAME
       cu - Call up another system

SYNOPSIS
       cu [ options ] [	system | phone | "dir" ]

DESCRIPTION
       The  cu	command	is used	to call	up another system and act as a dial in
       terminal.  It can also do simple	file transfers with no error checking.

       cu  takes  a  single argument, besides the options.  If the argument is
       the string "dir"	cu will	make a direct connection to  the  port.	  This
       may  only be used by users with write access to the port, as it permits
       reprogramming the modem.

       Otherwise, if the argument begins with a	digit, it is  taken  to	 be  a
       phone  number to	call.  Otherwise, it is	taken to be the	name of	a sys-
       tem to call.  The -z or --system	option may be used to  name  a	system
       beginning  with	a  digit,  and the -c or --phone option	may be used to
       name a phone number that	does not begin with a digit.

       cu locates a port to use	in the UUCP configuration files.  If a	simple
       system  name  is	given, it will select a	port appropriate for that sys-
       tem.  The -p, --port, -l, --line, -s and	--speed	options	may be used to
       control the port	selection.

       When  a connection is made to the remote	system,	cu forks into two pro-
       cesses.	One reads from the port	and writes to the terminal, while  the
       other reads from	the terminal and writes	to the port.

       cu  provides several commands that may be used during the conversation.
       The commands all	begin with an escape character,	initially  ~  (tilde).
       The escape character is only recognized at the beginning	of a line.  To
       send an escape character	to the remote system at	the start of  a	 line,
       it  must	 be entered twice.  All	commands are either a single character
       or a word beginning with	% (percent sign).

       cu recognizes the following commands:

       ~.   Terminate the conversation.

       ~! command
	    Run	command	in a shell.  If	command	is empty, starts up a shell.

       ~$ command
	    Run	command, sending the standard output to	the remote system.

       ~| command
	    Run	command, taking	the standard input from	the remote system.

       ~+ command
	    Run	command, taking	the standard input from	the remote system  and
	    sending the	standard output	to the remote system.

       ~#, ~%break
	    Send a break signal, if possible.

       ~c directory, ~%cd directory
	    Change the local directory.

       ~> file
	    Send  a  file to the remote	system.	 This just dumps the file over
	    the	communication line.  It	is assumed that	the remote  system  is
	    expecting it.

       ~<   Receive a file from	the remote system.  This prompts for the local
	    file name and for the remote command to execute to begin the  file
	    transfer.	It  continues accepting	data until the contents	of the
	    eofread variable are seen.

       ~p from to, ~%put from to
	    Send a file	to a remote Unix system.  This	runs  the  appropriate
	    commands on	the remote system.

       ~t from to, ~%take from to
	    Retrieve  a	 file from a remote Unix system.  This runs the	appro-
	    priate commands on the remote system.

       ~s variable value
	    Set	a cu variable to the given value.  If value is not given,  the
	    variable is	set to true.

       ~! variable
	    Set	a cu variable to false.

       ~z   Suspend  the  cu session.  This is only supported on some systems.
	    On systems for which ^Z may	be used	to suspend  a  job,  ~^Z  will
	    also suspend the session.

       ~%nostop
	    Turn off XON/XOFF handling.

       ~%stop
	    Turn on XON/XOFF handling.

       ~v   List all the variables and their values.

       ~?   List all commands.

	    cu	also  supports several variables.  They	may be listed with the
	    ~v command,	and set	with the ~s or ~!  commands.

       escape
	    The	escape character.  Initially ~ (tilde).

       delay
	    If this variable is	true, cu will delay for	a second after	recog-
	    nizing  the	escape character before	printing the name of the local
	    system.  The default is true.

       eol  The	list of	characters which are considered	to finish a line.  The
	    escape  character  is  only	recognized after one of	these is seen.
	    The	default	is carriage return, ^U,	^C, ^O,	^D, ^S,	^Q, ^R.

       binary
	    Whether to transfer	binary data when sending a file.  If  this  is
	    false,  then newlines in the file being sent are converted to car-
	    riage returns.  The	default	is false.

       binary-prefix
	    A string used before sending a binary character in a  file	trans-
	    fer, if the	binary variable	is true.  The default is ^Z.

       echo-check
	    Whether  to	check file transfers by	examining what the remote sys-
	    tem	echoes back.  This  probably  doesn't  work  very  well.   The
	    default is false.

       echonl
	    The	 character to look for after sending each line in a file.  The
	    default is carriage	return.

       timeout
	    The	timeout	to use,	in seconds,  when  looking  for	 a  character,
	    either  when  doing	 echo  checking	or when	looking	for the	echonl
	    character.	The default is 30.

       kill The	character to use delete	a line if the echo check  fails.   The
	    default is ^U.

       resend
	    The	 number	 of times to resend a line if the echo check continues
	    to fail.  The default is 10.

       eofwrite
	    The	string to write	after sending a	file with the ~> command.  The
	    default is ^D.

       eofread
	    The	 string	to look	for when receiving a file with the ~< command.
	    The	default	is $, which is intended	to be a	typical	shell  prompt.

       verbose
	    Whether  to	 print accumulated information during a	file transfer.
	    The	default	is true.

OPTIONS
       The following options may be given to cu.

       -e, --parity=even
	    Use	even parity.

       -o, --parity=odd
	    Use	odd parity.

       --parity=none
	    Use	no parity.  No parity is also used  if	both  -e  and  -o  are
	    given.

       -h, --halfduplex
	    Echo characters locally (half-duplex mode).

       -z system, --system system
	    The	system to call.

       -c phone-number,	--phone	phone-number
	    The	phone number to	call.

       -p port,	--port port
	    Name the port to use.

       -a port
	    Equivalent to --port port.

       -l line,	--line line
	    Name the line to use by giving a device name.  This	may be used to
	    dial out on	ports that are not listed in  the  UUCP	 configuration
	    files.  Write access to the	device is required.

       -s speed, --speed speed
	    The	speed (baud rate) to use.

       -#   Where # is a number, equivalent to --speed #.

       -n, --prompt
	    Prompt for the phone number	to use.

       -d   Enter debugging mode.  Equivalent to -debug	all.

       -x type,	--debug	type
	    Turn  on particular	debugging types.  The following	types are rec-
	    ognized: abnormal, chat, handshake,	uucp-proto, proto, port,  con-
	    fig,  spooldir, execute, incoming, outgoing.  Only abnormal, chat,
	    handshake, port, config, incoming and outgoing are meaningful  for
	    cu.

	    Multiple  types may	be given, separated by commas, and the --debug
	    option may appear multiple times.  A number	 may  also  be	given,
	    which  will	 turn  on that many types from the foregoing list; for
	    example,  --debug  2  is  equivalent  to  --debug	abnormal,chat.
	    --debug all	may be used to turn on all debugging options.

       -I file,	--config file
	    Set	 configuration file to use.  This option may not be available,
	    depending upon how cu was compiled.

       -v, --version
	    Report version information and exit.

       --help
	    Print a help message and exit.

BUGS
       This program does not work very well.

FILES
       The file	name may be changed at compilation time, so this  is  only  an
       approximation.

       /etc/uucp/config	- Configuration	file.

AUTHOR
       Ian Lance Taylor	<ian@airs.com>

			       Taylor UUCP 1.05				 cu(1)

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | BUGS | FILES | AUTHOR

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