GETTYTAB
Section: File Formats (5)
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BSD mandoc
BSD 4.2
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.
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 num0backspace delay"
-
- "bkstr0377alternate end of line character (input break)"
-
- "cbboolfalseuse crt backspace mode"
-
- "cdnum0carriage-return delay"
-
- "ceboolfalseuse crt erase algorithm"
-
- "ckboolfalseuse crt kill algorithm"
-
- "clstr" Ta NULLTa screen clear sequence
-
- "coboolfalseconsole - add"
-
`\n'
after login prompt
- "ds str" Ta So ^Y Sc Ta delayed suspend character
-
- "dx bool false set"
-
DECCTLQ
- "ecboolfalseleave echo"
-
OFF
- "epboolfalseterminal uses even parity"
-
- "erstr" Ta So ^? Sc Ta erase character
-
- "etstr" Ta So ^D Sc Ta end of text
-
(EOF
)
character
- "ev str" Ta NULL Ta initial enviroment
-
- "f0 num unused tty mode flags to write messages"
-
- "f1numunusedtty mode flags to read login name"
-
- "f2numunusedtty mode flags to leave terminal as"
-
- "fdnum0form-feed (vertical motion) delay"
-
- "flstr" Ta So ^O Sc Ta output flush character
-
- "hcboolfalsedo"
-
NOT
hangup line on last close
- "he str" Ta NULL Ta hostname editing string
-
- "hn str hostname hostname"
-
- "htboolfalseterminal has real tabs"
-
- "igboolfalseignore garbage characters in login name"
-
- "imstr" Ta NULL Ta initial (banner) message
-
- "instr" Ta So ^C Sc Ta interrupt character
-
- "isnumunusedinput speed"
-
- "klstr" Ta So ^U Sc Ta kill character
-
- "lcboolfalseterminal has lower case"
-
- "lmstrlogin:login prompt"
-
- "lnstr" Ta So ^V Sc Ta ``literal next'' character
-
- "lostr" Ta /usr/bin/login Ta program to exec when name obtained
-
- "ndnum0newline (line-feed) delay"
-
- "nlboolfalseterminal has (or might have) a newline character"
-
- "nxstrdefaultnext table (for auto speed selection)"
-
- "opboolfalseterminal uses odd parity"
-
- "osnumunusedoutput speed"
-
- "pcstr" Ta So \0 Sc Ta pad character
-
- "peboolfalseuse printer (hard copy) erase algorithm"
-
- "pfnum0delay"
-
between first prompt and following flush (seconds)
- "ps bool false line connected to a"
-
MICOM
port selector
- "qu str" Ta So ^\ Sc Ta quit character
-
- "rp str" Ta So ^R Sc Ta line retype character
-
- "rwboolfalsedo"
-
NOT
use raw for input, use cbreak
- "sp num unused line speed (input and output)"
-
- "su str" Ta So ^Z Sc Ta suspend character
-
- "tcstrnonetable continuation"
-
- "tonum0timeout (seconds)"
-
- "ttstr" Ta NULL Ta terminal type (for environment)
-
- "ubboolfalsedo unbuffered output (of prompts etc)"
-
- "ucboolfalseterminal is known upper case only"
-
- "westr" Ta So ^W Sc Ta word erase character
-
- "xcboolfalsedo
-
NOT
echo control chars as
`^X'
- "xf str" Ta So ^S Sc Ta XOFF
-
(stop output) character
- "xn str" Ta So ^Q Sc Ta 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,
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.
Local (new tty) flags are set in the top 16 bits
of this (32 bit) value.
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 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.
The
op
string
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).
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 form 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.
The
termcap
format is horrid, something more rational should
have been chosen.
HISTORY
The
gettytab
file format appeared in 4.2BSD.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- CAPABILITIES
-
- SEE ALSO
-
- BUGS
-
- HISTORY
-
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Time: 06:35:01 GMT, May 19, 2025