.\" Copyright (c) 1983, 1991 The Regents of the University of California.
.\" %sccs.include.redist.roff%
.\" @(#)gettytab.5 6.7 (Berkeley) %G%
.Nd terminal configuration data base
is a simplified version of the
used to describe terminal lines.
The initial terminal login process
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,
that is used to set global defaults for all other classes.
entry is read, then the entry for the class required
is used to override particular settings.)
for a description of the file layout.
column below lists defaults obtained if there is
no entry in the table obtained, nor one in the special
.Bl -column Namexx /usr/bin/login Default
.It Sy Name Type Default Description
.It "ap bool false terminal uses any parity"
.It "bd num 0 backspace delay"
.It "bk str 0377 alternate end of line character (input break)"
.It "cb bool false use crt backspace mode"
.It "cd num 0 carriage-return delay"
.It "ce bool false use crt erase algorithm"
.It "ck bool false use crt kill algorithm"
.It "cl str" Ta Dv NULL Ta
.No "screen clear sequence"
.It "co bool false console - add"
.It "ds str" Ta So Li ^Y Sc Ta
.No "delayed suspend character"
.It "ec bool false leave echo"
.It "ep bool false terminal uses even parity"
.It "er str" Ta So Li ^? Sc Ta
.It "et str" Ta So Li ^D Sc Ta
.It "ev str" Ta Dv NULL Ta
.It "f0 num unused tty mode flags to write messages"
.It "f1 num unused tty mode flags to read login name"
.It "f2 num unused tty mode flags to leave terminal as"
.It "fd num 0 form-feed (vertical motion) delay"
.It "fl str" Ta So Li ^O Sc Ta
.No "output flush character"
hangup line on last close
.It "he str" Ta Dv NULL Ta
.No "hostname editing string"
.It "hn str hostname hostname"
.It "ht bool false terminal has real tabs"
.It "ig bool false ignore garbage characters in login name"
.It "im str" Ta Dv NULL Ta
.No "initial (banner) message"
.It "in str" Ta So Li ^C Sc Ta
.No "interrupt character"
.It "is num unused input speed"
.It "kl str" Ta So Li ^U Sc Ta
.It "lc bool false terminal has lower case"
.It "lm str login: login prompt"
.It "ln str" Ta So Li ^V Sc Ta
.No "``literal next'' character"
.It "lo str" Ta Pa /usr/bin/login Ta
.No "program to exec when name obtained"
.It "nd num 0 newline (line-feed) delay"
.It "nl bool false terminal has (or might have) a newline character"
.It "nx str default next table (for auto speed selection)"
.It "op bool false terminal uses odd parity"
.It "os num unused output speed"
.It "pc str" Ta So Li \e0 Sc Ta
.It "pe bool false use printer (hard copy) erase algorithm"
between first prompt and following flush (seconds)
.It "ps bool false line connected to a"
.It "qu str" Ta So Li \&^\e Sc Ta
.It "rp str" Ta So Li ^R Sc Ta
.No "line retype character"
use raw for input, use cbreak
.It "sp num unused line speed (input and output)"
.It "su str" Ta So Li ^Z Sc Ta
.It "tc str none table continuation"
.It "to num 0 timeout (seconds)"
.It "tt str" Ta Dv NULL Ta
.No "terminal type (for environment)"
.It "ub bool false do unbuffered output (of prompts etc)"
.It "uc bool false terminal is known upper case only"
.It "we str" Ta So Li ^W Sc Ta
.No "word erase character"
.It "xf str" Ta So Li ^S Sc Ta Dv XOFF
.It "xn str" Ta So Li ^Q Sc Ta Dv XON
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 inadequate,
any (or all) of these three may be overriden
numeric specifications, which can be used to specify
(usually in octal, with a leading '0')
the exact values of the flags.
Local (new tty) flags are set in the top 16 bits
(presumed to indicate a line break)
it will restart using the table indicated by the
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.
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
The initial message, and login message,
may include the character sequence
the hostname or tty name respectively.
obtains a single '%' character.)
The hostname is normally obtained from the system,
In either case it may be edited with
string is a sequence of characters, each character that
is neither '@' nor '#' is copied into the final hostname.
string, causes one character from the real hostname to
be copied to the final hostname.
string, causes the next character of the real hostname
Surplus '@' and '#' characters are ignored.
When getty execs the login process, given
.Dq Pa /usr/bin/login ) ,
the enviroment to include the terminal type, as indicated
string, can be used to enter additional data into
It is a list of comma separated strings, each of which
will presumably be of the form
If a non-zero timeout is specified, with
then getty will exit within the indicated
number of seconds, either having
received a login name and passed control
or having received an alarm signal, and exited.
This may be useful to hangup dial in lines.
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
does not check parity of input characters in
The special characters (erase, kill, etc.) are reset to system defaults
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 form its general lack of flexibility, some
of the delay algorithms are not implemented.
The terminal driver should support sane delay settings.
format is horrid, something more rational should
file format appeared in 4.2BSD.
projects / unix-history / blob