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NAME    [Toc]    [Back]

     gettytab - terminal configuration database

SYNOPSIS    [Toc]    [Back]


DESCRIPTION    [Toc]    [Back]

     The gettytab file is a simplified version of the  termcap(5)
database 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
database 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    [Toc]    [Back]

     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.
     bk         str       0377      Alternative end-of-line character (input
     c0        num       unused    TTY  control  flags  to  write
     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 `0 after login
     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
     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
     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
     i2        num       unused    TTY input flags to leave  terminal as.
     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
     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/login Program to execute when
name obtained.
     mb        bool      false     Do flow control based on  carrier.
     nl        bool      false     Terminal has (or might have) a
     np        bool      false     Terminal uses no parity (i.e.,
     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
     o2        num       unused    TTY output flags to leave terminal as.
     op        bool      false     Terminal uses odd parity.
     os        num       unused    Output speed.
     pc        str       ` '      Pad character.
     pe         bool      false     Use printer (hard copy) erase
     pf        num       0         Delay between first prompt and
                                   flush (seconds).
     pp        str       unused    PPP authentication program.
     ps        bool      false     Line connected to a MICOM port
     qu        str       `^'      Quit character.
     rp        str       `^R'      Line retype character.
     rw        bool      false     Do not use raw for input,  use
     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  environment).
     ub         bool       false      Do  unbuffered  output  (of
prompts etc).
     we        str       `^W'      Word erase character.
     xc        bool      false     Do not echo control characters
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)
     nd        num       0         Newline (line-feed) delay.
     uc         bool       false     Terminal is known upper case

     If no line speed is specified, speed  will  not  be  altered
from that which
     prevails  when  getty(8) 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  and
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 overridden
with one of the
     c0, c1, c2, i0, i1, i2, l0, l1, l2, o0, o1,  or  o2  numeric
     which can be used to specify (usually in octal, with a leading `0') the
     exact values of the flags.  These flags  correspond  to  the
     c_cflag, c_iflag, c_lflag, and c_oflag fields, respectively.
Each of
     these sets must be completely  specified  to  be  effective.
The f0, f1, and
     f2  are excepted for backwards compatibility with a previous
     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 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(5)).   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 environment
 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 character
  that  is neither `@' nor `#' is copied into the
final hostname.
  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 returned
 by uname(3).

     %%    A `%' character.

     When getty(8) executes the login process  given  in  the  lo
string (usually
     /usr/bin/login), it will have set the environment 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

     If  a  non-zero  timeout is specified with to, then getty(8)
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
     exited.  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 generate
 odd parity output.  Note: this only applies  while  getty(8) is being
     run; terminal driver limitations prevent a more complete implementation.
     getty(8) does not check parity of input  characters  in  RAW

     If a pp string is specified and a PPP link bring-up sequence
is recognized,
 getty(8) will invoke the program referenced by the pp
     This can be used to handle incoming PPP calls.

SEE ALSO    [Toc]    [Back]

     login(1), gethostname(3), uname(3), termcap(5), getty(8)

HISTORY    [Toc]    [Back]

     The gettytab file format appeared in 4.2BSD.

BUGS    [Toc]    [Back]

     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  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.

     The termcap(5) format is  horrid;  something  more  rational
should have been

OpenBSD      3.6                          April      19,     1994
[ Back ]
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