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GETTYTAB(5)		    BSD	File Formats Manual		   GETTYTAB(5)

NAME
     gettytab -- terminal configuration	data base

SYNOPSIS
     gettytab

DESCRIPTION
     The gettytab file is a simplified version of the termcap(5) data base
     used to describe terminal lines.  The initial terminal login process
     getty(8) accesses the gettytab file each time it starts, allowing simpler
     reconfiguration of	terminal characteristics.  Each	entry in the data base
     is	used to	describe one class of terminals.

     Where to run getty(8) processes is	normally defined by ttys(5).

     There is a	default	terminal class,	default, that is used to set global
     defaults for all other classes.  (That is,	the default entry is read,
     then the entry for	the class required is used to override particular set-
     tings.)  The default entry	is also	normally read by other programs	that
     present login prompts to the user,	such as	telnetd(8), in order to	re-
     trieve the	values of the he, hn, im, and if capabilities.

CAPABILITIES
     Refer to termcap(5) for a description of the file layout.	The default
     column below lists	defaults obtained if there is no entry in the table
     obtained, nor one in the special default table.

     Name      Type		 Default    Description
     ab	       bool		 false	    Auto-baud speed select mechanism
					    for	the Micom 600 portselector.
					    Selection is done by looking at
					    how	the character `\r' is garbled
					    at 300, 1200, 4800,	and 9600 baud.
     al	       str		 NULL	    user to auto-login instead of
					    prompting
     ap	       bool		 false	    terminal uses any parity
     bk	       str		 0377	    alternative	end of line character
					    (input break)
     b2	       str		 0377	    alternative	end of line character
					    (input break)
     c0	       num		 unused	    tty	control	flags to write
					    messages
     c1	       num		 unused	    tty	control	flags to read login
					    name
     c2	       num		 unused	    tty	control	flags to leave
					    terminal as
     ce	       bool		 false	    use	crt erase algorithm
     ck	       bool		 false	    use	crt kill algorithm
     cl	       str		 NULL	    screen clear sequence
     co	       bool		 false	    console - add `\r\n' after login
					    prompt
     cs	       bool		 false	    clear screen based on terminal
					    type in /etc/ttys
     ds	       str		 `^Y'	    delayed suspend character
     dx	       bool		 false	    set	DECCTLQ
     ec	       bool		 false	    leave echo OFF
     ep	       bool		 false	    terminal uses even parity
     er	       str		 `^?'	    erase character
     et	       str		 `^D'	    end	of text	(EOF) character
     ev	       str		 NULL	    initial environment
     f0	       num		 unused	    tty	mode flags to write messages
     f1	       num		 unused	    tty	mode flags to read login name
     f2	       num		 unused	    tty	mode flags to leave terminal
					    as
     fl	       str		 `^O'	    output flush character
     hc	       bool		 false	    do NOT hangup line on last close
     he	       str		 NULL	    hostname editing string
     hn	       str		 hostname   hostname
     ht	       bool		 false	    terminal has real tabs
     i0	       num		 unused	    tty	input flags to write messages
     i1	       num		 unused	    tty	input flags to read login name
     i2	       num		 unused	    tty	input flags to leave terminal
					    as
     if	       str		 NULL	    display named file before prompt,
					    like /etc/issue
     ig	       bool		 false	    ignore garbage characters in login
					    name
     im	       str		 NULL	    initial (banner) message
     in	       str		 `^C'	    interrupt character
     is	       num		 unused	    input speed
     kl	       str		 `^U'	    kill character
     l0	       num		 unused	    tty	local flags to write messages
     l1	       num		 unused	    tty	local flags to read login name
     l2	       num		 unused	    tty	local flags to leave terminal
					    as
     lc	       bool		 false	    terminal has lower case
     lm	       str		 login:	    login prompt
     ln	       str		 `^V'	    ``literal next'' character
     lo	       str		 /usr/bin/loginprogram to exec when name
					    obtained
     mb	       bool		 false	    do flow control based on carrier
     nl	       bool		 false	    terminal has (or might have) a
					    newline character
     nn	       bool		 false	    do not prompt for a	login name
     np	       bool		 false	    terminal uses no parity (i.e.
					    8-bit characters)
     nx	       str		 default    next table (for auto speed
					    selection)
     o0	       num		 unused	    tty	output flags to	write messages
     o1	       num		 unused	    tty	output flags to	read login
					    name
     o2	       num		 unused	    tty	output flags to	leave terminal
					    as
     op	       bool		 false	    terminal uses odd parity
     os	       num		 unused	    output speed
     pc	       str		 `\0'	    pad	character
     pe	       bool		 false	    use	printer	(hard copy) erase
					    algorithm
     pf	       num		 0	    delay between first	prompt and
					    following flush (seconds)
     pp	       str		 unused	    PPP	authentication program
     ps	       bool		 false	    line connected to a	MICOM port se-
					    lector
     qu	       str		 `^\'	    quit character
     rp	       str		 `^R'	    line retype	character
     rw	       bool		 false	    do NOT use raw for input, use
					    cbreak
     sp	       num		 unused	    line speed (input and output)
     st	       str		 `^T'	    status character
     su	       str		 `^Z'	    suspend character
     tc	       str		 none	    table continuation
     to	       num		 0	    timeout (seconds)
     tt	       str		 NULL	    terminal type (for environment)
     ub	       bool		 false	    do unbuffered output (of prompts
					    etc)
     we	       str		 `^W'	    word erase character
     xc	       bool		 false	    do NOT echo	control	chars as `^X'
     xf	       str		 `^S'	    XOFF (stop output) character
     xn	       str		 `^Q'	    XON	(start output) character

     The following capabilities	are no longer supported	by getty(8):

     bd	       num		 0	    backspace delay
     cb	       bool		 false	    use	crt backspace mode
     cd	       num		 0	    carriage-return delay
     fd	       num		 0	    form-feed (vertical	motion)	delay
     nd	       num		 0	    newline (line-feed)	delay
     uc	       bool		 false	    terminal is	known upper case only

     If	no line	speed is specified, speed will not be altered from that	which
     prevails when getty is entered.  Specifying an input or output speed will
     override line speed for stated direction only.

     Terminal modes to be used for the output of the message, for input	of the
     login name, and to	leave the terminal set as upon completion, are derived
     from the boolean flags specified.	If the derivation should prove inade-
     quate, any	(or all) of these three	may be overridden with one of the c0,
     c1, c2, i0, i1, i2, l0, l1, l2, o0, o1, or	o2 numeric specifications,
     which can be used to specify (usually in octal, with a leading '0') the
     exact values of the flags.	 These flags correspond	to the termios
     c_cflag, c_iflag, c_lflag,	and c_oflag fields, respectively.  Each	these
     sets must be completely specified to be effective.	 The f0, f1, and f2
     are excepted for backwards	compatibility with a previous incarnation of
     the TTY sub-system.  In these flags the bottom 16 bits of the (32 bits)
     value contain the sgttyb sg_flags field, while the	top 16 bits represent
     the local mode word.

     Should getty(8) receive a null character (presumed	to indicate a line
     break) it will restart using the table indicated by the nx	entry.	If
     there is none, it will re-use its original	table.

     Delays are	specified in milliseconds, the nearest possible	delay avail-
     able in the tty driver will be used.  Should greater certainty be de-
     sired, delays with	values 0, 1, 2,	and 3 are interpreted as choosing that
     particular	delay algorithm	from the driver.

     The cl screen clear string	may be preceded	by a (decimal) number of mil-
     liseconds of delay	required (a la termcap).  This delay is	simulated by
     repeated use of the pad character pc.

     The initial message, and login message, im	and lm may include any of the
     following character sequences, which expand to information	about the en-
     vironment in which	getty(8) is running.

     %d	   The current date.
     %h	   The hostname	of the machine,	which is normally obtained from	the
	   system using	gethostname(3),	but may	also be	overridden by the hn
	   table entry.	 In either case	it may be edited with the he string.
	   A '@' in the	he string causes one character from the	real hostname
	   to be copied	to the final hostname.	A '#' in the he	string causes
	   the next character of the real hostname to be skipped.  Each	char-
	   acter that is neither '@' nor '#' is	copied into the	final host-
	   name.  Surplus '@' and '#' characters are ignored.
     %t	   The tty name.
     %m, %r, %s, %v
	   The type of machine,	release	of the operating system, name of the
	   operating system, and version of the	kernel,	respectively, as re-
	   turned by uname(3).
     %%	   A "%" character.

     When getty	execs the login	process, given in the lo string	(usually
     "/usr/bin/login"),	it will	have set the environment to include the	termi-
     nal type, as indicated by the tt string (if it exists).  The ev string,
     can be used to enter additional data into the environment.	 It is a list
     of	comma separated	strings, each of which will presumably be of the form
     name=value.

     If	a non-zero timeout is specified, with to, then getty will exit within
     the indicated number of seconds, either having received a login name and
     passed control to login(1), or having received an alarm signal, and ex-
     ited.  This may be	useful to hangup dial in lines.

     Output from getty(8) is even parity unless	op or np is specified.	The op
     string may	be specified with ap to	allow any parity on input, but gener-
     ate odd parity output.  Note: this	only applies while getty is being run,
     terminal driver limitations prevent a more	complete implementation.
     getty(8) does not check parity of input characters	in RAW mode.

     If	pp string is specified and a Point to Point Protocol (PPP) link
     bringup sequence is recognized, getty(8) will invoke the program refer-
     enced by the pp string, e.g.  pppd(8).  This can be used to handle	incom-
     ing PPP calls.

SEE ALSO
     login(1), gethostname(3), uname(3), termcap(5), ttys(5), getty(8),
     pppd(8), telnetd(8)

HISTORY
     The gettytab file format appeared in 4.2BSD.

BUGS
     The special characters (erase, kill, etc.)	are reset to system defaults
     by	login(1).  In all cases, '#' or	'^H' typed in a	login name will	be
     treated as	an erase character, and	'@' will be treated as a kill charac-
     ter.

     The delay stuff is	a real crock.  Apart from its general lack of flexi-
     bility, some of the delay algorithms are not implemented.	The terminal
     driver should support sane	delay settings.

     The he capability is stupid.

     The termcap(5) format is horrid, something	more rational should have been
     chosen.

BSD				October	7, 2006				   BSD

NAME | SYNOPSIS | DESCRIPTION | CAPABILITIES | SEE ALSO | HISTORY | BUGS

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