GETTYTAB(5)

NAME
gettytab - terminal configuration data base

SYNOPSIS
/etc/gettytab

DESCRIPTION
Gettytab 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.

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 settings.)

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
ap	bool	false	terminal uses any parity
bd	num	0	backspace delay
bk	str	0377	alternate end of line character (input break)
cb	bool	false	use crt backspace mode
cd	num	0	carriage-return delay
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 \n after login prompt
ds	str	^Y	delayed suspend character
dx	bool	false	set DECCTLQ
ec	bool	false	leave echo OFF
ed	str	","	Delimeter character for "ev" strings
ep	bool	false	terminal uses even parity
er	str	^?	erase character
et	str	^D	end of text (EOF) character
ev	str	NULL	initial enviroment
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
fd	num	0	form-feed (vertical motion) delay
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
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
lc	bool	false	terminal has lower case
lm	str	login:	login prompt
ln	str	^V	``literal next'' character
lo	str	/bin/login	program to exec when name obtained
lt	bool	false	invoke "lo" program with "-t" (preserves tty setup)
nd	num	0	newline (line-feed) delay
nl	bool	false	terminal has (or might have) a newline character
nx	str	default	next table (for auto speed selection)
op	bool	false	terminal uses odd parity
os	num	unused	output speed
o8	bool	false	send output as 8-bits (for prompts etc)
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)
ps	bool	false	line connected to a MICOM port selector
p0	bool	true	transmit 0 as parity bit if ap is set
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)
su	str	^Z	suspend character
tc	str	none	table continuation
to	num	0	timeout (seconds)
tt	str	NULL	terminal type (for enviroment)
ub	bool	false	do unbuffered output (of prompts etc)
uc	bool	false	terminal is known upper case only
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

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 ("lt" needed), are derived from the boolean flags specified. If the derivation should prove inadequate, any (or all) of these three may be overriden with one of the f0, f1, or f2 numeric specifications, which can be used to specify (usually in octal, with a leading '0') the exact values of the flags. The flags are defined in C source terms (although in hexadecimal rather than octal) in the file <sys/ioctl.h>, starting with the definition of TANDEM and concluding with the definition of NOFLUSH; for further information see tty(4).

Should getty 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 available in the tty driver will be used. Should greater certainty be desired, 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 milliseconds 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 the character sequence %h or %t to obtain the hostname or tty name respectively. (%% obtains a single '%' character.) The hostname is normally obtained from the system, but may be set by the hn table entry. In either case it may be edited with he. The he string is a sequence of characters, each character that is neither '@' nor '#' is copied into the final hostname. 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. Surplus '@' and '#' characters are ignored.

When getty execs the login process, given in the lo string (usually "/usr/bin/login"), it will have set the enviroment to include the terminal 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 (can be changed with "ed") 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, or having received an alarm signal, and exited. This may be useful to hangup dial in lines.

Output from getty is even parity unless op is specified. Op may be specified with ap to allow any parity on input, but generate odd parity output. Note: this only applies while getty is being run, terminal driver limitations prevent a more complete implementation. Getty does not check parity of input characters in RAW mode.

SEE ALSO
login(1), termcap(5), getty(8).

BUGS
The special characters (erase, kill, etc.) are reset to system defaults by login(1), this can be prevented by the "lt" option. In all cases, '#' or '^H' typed in a login name will be treated as an erase character, and '@' will be treated as a kill character.

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

The he capability is stupid.

Termcap format is horrid, something more rational should have been chosen.