6186bd5dc7
I get on this topic will go straight to /dev/null. This is absolutely the last word on this topic you'll see from me. Too much time has already been wasted.
325 lines
9.6 KiB
Groff
325 lines
9.6 KiB
Groff
.\" Copyright (c) 1983, 1991 The Regents of the University of California.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)gettytab.5 6.7 (Berkeley) 5/10/91
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.\"
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.Dd May 10, 1991
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.Dt GETTYTAB 5
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.Os BSD 4.2
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.Sh NAME
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.Nm gettytab
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.Nd terminal configuration data base
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.Sh SYNOPSIS
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.Nm gettytab
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.Sh DESCRIPTION
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The
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.Nm gettytab
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file
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is a simplified version of the
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.Xr termcap 5
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data base
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used to describe terminal lines.
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The initial terminal login process
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.Xr getty 8
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accesses the
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.Nm gettytab
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file each time it starts, allowing simpler
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reconfiguration of terminal characteristics.
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Each entry in the data base
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is used to describe one class of terminals.
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.Pp
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There is a default terminal class,
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.Em default ,
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that is used to set global defaults for all other classes.
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(That is, the
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.Em default
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entry is read, then the entry for the class required
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is used to override particular settings.)
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.Sh CAPABILITIES
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Refer to
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.Xr termcap 5
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for a description of the file layout.
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The
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.Em default
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column below lists defaults obtained if there is
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no entry in the table obtained, nor one in the special
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.Em default
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table.
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.Bl -column Namexx /usr/bin/login Default
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.It Sy Name Type Default Description
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.It "ap bool false terminal uses any parity"
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.It "bd num 0 backspace delay"
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.It "bk str 0377 alternate end of line character (input break)"
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.It "cb bool false use crt backspace mode"
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.It "cd num 0 carriage-return delay"
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.It "ce bool false use crt erase algorithm"
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.It "ck bool false use crt kill algorithm"
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.It "cl str" Ta Dv NULL Ta
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.No "screen clear sequence"
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.It "co bool false console - add"
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.Ql \en
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after login prompt
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.It "ds str" Ta So Li ^Y Sc Ta
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.No "delayed suspend character"
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.It "dx bool false set"
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.Dv DECCTLQ
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.It "ec bool false leave echo"
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.Tn OFF
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.It "ep bool false terminal uses even parity"
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.It "er str" Ta So Li ^? Sc Ta
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.No "erase character"
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.It "et str" Ta So Li ^D Sc Ta
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.No "end of text"
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.Pq Dv EOF
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character
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.It "ev str" Ta Dv NULL Ta
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.No "initial environment"
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.It "f0 num unused tty mode flags to write messages"
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.It "f1 num unused tty mode flags to read login name"
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.It "f2 num unused tty mode flags to leave terminal as"
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.It "fd num 0 form-feed (vertical motion) delay"
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.It "fl str" Ta So Li ^O Sc Ta
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.No "output flush character"
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.It "hc bool false do"
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.Tn NOT
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hangup line on last close
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.It "he str" Ta Dv NULL Ta
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.No "hostname editing string"
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.It "hn str hostname hostname"
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.It "ht bool false terminal has real tabs"
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.It "ig bool false ignore garbage characters in login name"
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.It "im str" Ta Dv NULL Ta
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.No "initial (banner) message"
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.It "in str" Ta So Li ^C Sc Ta
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.No "interrupt character"
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.It "is num unused input speed"
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.It "kl str" Ta So Li ^U Sc Ta
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.No "kill character"
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.It "lc bool false terminal has lower case"
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.It "lm str login: login prompt"
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.It "ln str" Ta So Li ^V Sc Ta
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.No "``literal next'' character"
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.It "lo str" Ta Pa /usr/bin/login Ta
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.No "program to exec when name obtained"
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.It "nd num 0 newline (line-feed) delay"
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.It "nl bool false terminal has (or might have) a newline character"
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.It "np bool false terminal uses no parity (8bit chars)"
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.It "nx str default next table (for auto speed selection)"
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.It "op bool false terminal uses odd parity"
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.It "os num unused output speed"
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.It "pc str" Ta So Li \e0 Sc Ta
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.No "pad character"
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.It "pe bool false use printer (hard copy) erase algorithm"
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.It "pf num 0 delay"
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between first prompt and following flush (seconds)
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.It "ps bool false line connected to a"
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.Tn MICOM
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port selector
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.It "qu str" Ta So Li \&^\e Sc Ta
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.No "quit character"
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.It "rp str" Ta So Li ^R Sc Ta
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.No "line retype character"
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.It "rw bool false do"
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.Tn NOT
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use raw for input, use cbreak
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.It "sp num unused line speed (input and output)"
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.It "su str" Ta So Li ^Z Sc Ta
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.No "suspend character"
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.It "tc str none table continuation"
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.It "to num 0 timeout (seconds)"
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.It "tt str" Ta Dv NULL Ta
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.No "terminal type (for environment)"
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.It "ub bool false do unbuffered output (of prompts etc)"
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.It "uc bool false terminal is known upper case only"
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.It "we str" Ta So Li ^W Sc Ta
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.No "word erase character"
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.It "xc bool false do
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.Tn NOT
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echo control chars as
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.Ql ^X
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.It "xf str" Ta So Li ^S Sc Ta Dv XOFF
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(stop output) character
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.It "xn str" Ta So Li ^Q Sc Ta Dv XON
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(start output) character
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.El
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.Pp
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If no line speed is specified, speed will not be altered
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from that which prevails when getty is entered.
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Specifying an input or output speed will override
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line speed for stated direction only.
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.Pp
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Terminal modes to be used for the output of the message,
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for input of the login name,
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and to leave the terminal set as upon completion,
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are derived from the boolean flags specified.
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If the derivation should prove inadequate,
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any (or all) of these three may be overridden
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with one of the
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.Em \&f0 ,
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.Em \&f1 ,
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or
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.Em \&f2
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numeric specifications, which can be used to specify
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(usually in octal, with a leading '0')
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the exact values of the flags.
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Local (new tty) flags are set in the top 16 bits
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of this (32 bit) value.
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.Pp
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Should
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.Xr getty
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receive a null character
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(presumed to indicate a line break)
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it will restart using the table indicated by the
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.Em nx
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entry. If there is none, it will re-use its original table.
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.Pp
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Delays are specified in milliseconds, the nearest possible
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delay available in the tty driver will be used.
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Should greater certainty be desired, delays
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with values 0, 1, 2, and 3 are interpreted as
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choosing that particular delay algorithm from the driver.
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.Pp
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The
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.Em \&cl
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screen clear string may be preceded by a (decimal) number
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of milliseconds of delay required (a la termcap).
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This delay is simulated by repeated use of the pad character
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.Em \&pc .
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.Pp
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The initial message, and login message,
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.Em \&im
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and
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.Em \&lm
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may include the character sequence
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.Em \&%h
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or
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.Em \&%t
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to obtain
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the hostname or tty name respectively.
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.Pf ( Em %%
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obtains a single '%' character.)
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The hostname is normally obtained from the system,
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but may be set by the
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.Em \&hn
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table entry.
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In either case it may be edited with
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.Em \&he .
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The
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.Em \&he
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string is a sequence of characters, each character that
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is neither '@' nor '#' is copied into the final hostname.
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A '@' in the
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.Em \&he
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string, causes one character from the real hostname to
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be copied to the final hostname.
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A '#' in the
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.Em \&he
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string, causes the next character of the real hostname
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to be skipped.
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Surplus '@' and '#' characters are ignored.
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.Pp
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When getty execs the login process, given
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in the
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.Em \&lo
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string (usually
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.Dq Pa /usr/bin/login ) ,
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it will have set
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the environment to include the terminal type, as indicated
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by the
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.Em \&tt
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string (if it exists).
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The
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.Em \&ev
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string, can be used to enter additional data into
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the environment.
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It is a list of comma separated strings, each of which
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will presumably be of the form
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.Em name=value .
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.Pp
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If a non-zero timeout is specified, with
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.Em \&to ,
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then getty will exit within the indicated
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number of seconds, either having
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received a login name and passed control
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to
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.Xr login ,
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or having received an alarm signal, and exited.
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This may be useful to hangup dial in lines.
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.Pp
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Output from
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.Xr getty
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is even parity unless
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.Em \&op
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is specified.
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The
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.Em \&op
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string
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may be specified with
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.Em \&ap
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to allow any parity on input, but generate odd parity output.
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Note: this only applies while getty is being run,
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terminal driver limitations prevent a more complete
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implementation.
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.Xr Getty
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does not check parity of input characters in
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.Dv RAW
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mode.
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.Sh SEE ALSO
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.Xr login 1 ,
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.Xr termcap 5 ,
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.Xr getty 8 .
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.Sh BUGS
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The special characters (erase, kill, etc.) are reset to system defaults
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by
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.Xr login 1 .
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In
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.Em all
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cases, '#' or '^H' typed in a login name will be treated as
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an erase character, and '@' will be treated as a kill character.
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.Pp
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The delay stuff is a real crock.
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Apart form its general lack of flexibility, some
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of the delay algorithms are not implemented.
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The terminal driver should support sane delay settings.
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.Pp
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The
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.Em \&he
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capability is stupid.
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.Pp
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The
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.Xr termcap
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format is horrid, something more rational should
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have been chosen.
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.Sh HISTORY
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The
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.Nm gettytab
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file format appeared in 4.2BSD.
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