7e6cabd06e
Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
422 lines
11 KiB
Groff
422 lines
11 KiB
Groff
.\" Copyright (c) 1985, 1990, 1993
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.\" The Regents of the University of California. 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. 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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.\" @(#)tset.1 8.1 (Berkeley) 6/9/93
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.\" $FreeBSD$
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.\"
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.Dd June 6, 2015
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.Dt TSET 1
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.Os
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.Sh NAME
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.Nm tset ,
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.Nm reset
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.Nd terminal initialization
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.Sh SYNOPSIS
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.Nm
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.Op Fl IQrSs
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.Op Fl
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.Op Fl e Ar ch
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.Op Fl i Ar ch
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.Op Fl k Ar ch
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.Op Fl m Ar mapping
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.Op Ar terminal
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.Nm reset
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.Op Fl IQrSs
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.Op Fl
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.Op Fl e Ar ch
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.Op Fl i Ar ch
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.Op Fl k Ar ch
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.Op Fl m Ar mapping
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.Op Ar terminal
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.Sh DESCRIPTION
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The
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.Nm
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utility initializes terminals.
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It first determines the type of terminal that you are using.
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This determination is done as follows, using the first terminal type found.
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.Pp
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.Bl -bullet -compact -offset indent
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.It
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The
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.Ar terminal
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argument specified on the command line.
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.It
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The value of the
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.Ev TERM
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environment variable.
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.It
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The terminal type associated with the standard error output device in the
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.Pa /etc/ttys
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file.
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.It
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The default terminal type, ``unknown''.
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.El
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.Pp
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If the terminal type was not specified on the command-line, the
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.Fl m
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option mappings are then applied (see below for more information).
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Then, if the terminal type begins with a question mark (``?''), the user is
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prompted for confirmation of the terminal type.
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An empty response confirms the type, or, another type can be entered to
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specify a new type.
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Once the terminal type has been determined, the termcap entry for the terminal
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is retrieved.
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If no termcap entry is found for the type, the user is prompted for another
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terminal type.
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.Pp
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Once the termcap entry is retrieved, the window size, backspace, interrupt
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and line kill characters (among many other things) are set and the terminal
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and tab initialization strings are sent to the standard error output.
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Finally, if the erase, interrupt and line kill characters have changed,
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or are not set to their default values, their values are displayed to the
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standard error output.
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.Pp
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When invoked as
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.Nm reset ,
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.Nm
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sets cooked and echo modes, turns off cbreak and raw modes, turns on
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newline translation and resets any unset special characters to their
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default values before doing the terminal initialization described above.
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This is useful after a program dies leaving a terminal in an abnormal state.
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Note, you may have to type
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.Dq Li <LF>reset<LF>
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(the line-feed character is normally control-J) to get the terminal
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to work, as carriage-return may no longer work in the abnormal state.
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Also, the terminal will often not echo the command.
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.Pp
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The options are as follows:
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.Bl -tag -width flag
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.It Fl
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The terminal type is displayed to the standard output, and the terminal is
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not initialized in any way.
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.It Fl e
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Set the erase character to
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.Ar ch .
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.It Fl I
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Do not send the terminal or tab initialization strings to the terminal.
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.It Fl i
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Set the interrupt character to
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.Ar ch .
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.It Fl k
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Set the line kill character to
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.Ar ch .
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.It Fl m
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Specify a mapping from a port type to a terminal.
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See below for more information.
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.It Fl Q
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Do not display any values for the erase, interrupt and line kill characters.
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.It Fl r
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Print the terminal type to the standard error output.
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.It Fl S
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Print the terminal type and the termcap entry to the standard output.
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See the section below on setting the environment for details.
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.It Fl s
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Print the sequence of shell commands to initialize the environment variables
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.Ev TERM
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and
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.Ev TERMCAP
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to the standard output.
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See the section below on setting the environment for details.
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.El
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.Pp
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The arguments for the
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.Fl e ,
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.Fl i
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and
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.Fl k
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options may either be entered as actual characters or by using the
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.Dq hat
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notation, i.e., control-h may be specified as
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.Dq Li ^H
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or
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.Dq Li ^h .
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.Sh SETTING THE ENVIRONMENT
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It is often desirable to enter the terminal type and information about
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the terminal's capabilities into the shell's environment.
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This is done using the
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.Fl S
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and
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.Fl s
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options.
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.Pp
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When the
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.Fl S
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option is specified, the terminal type and the termcap entry are written
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to the standard output, separated by a space and without a terminating
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newline.
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This can be assigned to an array by
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.Nm csh
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and
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.Nm ksh
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users and then used like any other shell array.
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.Pp
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When the
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.Fl s
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option is specified, the commands to enter the information into the
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shell's environment are written to the standard output.
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If the
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.Ev SHELL
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environment variable ends in ``csh'', the commands are for the
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.Nm csh ,
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otherwise, they are for
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.Xr sh 1 .
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Note, the
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.Nm csh
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commands set and unset the shell variable
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.Dq noglob ,
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leaving it unset.
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The following line in the
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.Pa .login
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or
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.Pa .profile
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files will initialize the environment correctly:
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.Bd -literal -offset indent
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eval \`tset -s options ... \`
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.Ed
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.Pp
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To demonstrate a simple use of the
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.Fl S
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option, the following lines in the
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.Pa .login
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file have an equivalent effect:
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.Bd -literal -offset indent
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set noglob
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set term=(`tset -S options ...`)
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setenv TERM $term[1]
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setenv TERMCAP "$term[2]"
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unset term
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unset noglob
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.Ed
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.Sh TERMINAL TYPE MAPPING
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When the terminal is not hardwired into the system (or the current system
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information is incorrect) the terminal type derived from the
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.Pa /etc/ttys
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file or the
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.Ev TERM
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environment variable is often something generic like
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.Dq network ,
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.Dq dialup ,
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or
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.Dq unknown .
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When
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.Nm
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is used in a startup script
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.Pf ( Pa .profile
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for
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.Xr sh 1
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users or
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.Pa .login
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for
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.Xr csh 1
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users) it is often desirable to provide information about the type of
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terminal used on such ports.
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The purpose of the
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.Fl m
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option is to
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.Dq map
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from some set of conditions to a terminal type, that is, to
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tell
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.Nm
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``If I'm on this port at a particular speed, guess that I'm on that
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kind of terminal''.
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.Pp
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The argument to the
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.Fl m
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option consists of an optional port type, an optional operator, an optional
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baud rate specification, an optional colon (``:'') character and a terminal
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type.
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The port type is a string (delimited by either the operator or the colon
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character).
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The operator may be any combination of:
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.Dq Li \&> ,
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.Dq Li \&< ,
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.Dq Li \&@ ,
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and
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.Dq Li \&! ;
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.Dq Li \&>
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means greater than,
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.Dq Li \&<
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means less than,
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.Dq Li \&@
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means equal to
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and
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.Dq Li !\&
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inverts the sense of the test.
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The baud rate is specified as a number and is compared with the speed
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of the standard error output (which should be the control terminal).
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The terminal type is a string.
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.Pp
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If the terminal type is not specified on the command line, the
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.Fl m
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mappings are applied to the terminal type.
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If the port type and baud rate match the mapping, the terminal type specified
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in the mapping replaces the current type.
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If more than one mapping is specified, the first applicable mapping is used.
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.Pp
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For example, consider the following mapping:
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.Dq Li dialup>9600:vt100 .
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The port type is
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.Dq Li dialup ,
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the operator is
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.Dq Li > ,
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the baud rate specification is
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.Dq Li 9600 ,
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and the terminal type is
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.Dq Li vt100 .
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The result of this mapping is to specify that if the terminal type is
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.Dq Li dialup ,
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and the baud rate is greater than 9600 baud, a terminal type of
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.Dq Li vt100
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will be used.
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.Pp
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If no port type is specified, the terminal type will match any port type,
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for example,
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.Dq Li -m dialup:vt100 -m :?xterm
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will cause any dialup port, regardless of baud rate, to match the terminal
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type
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.Dq Li vt100 ,
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and any non-dialup port type to match the terminal type
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.Dq Li ?xterm .
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Note, because of the leading question mark, the user will be
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queried on a default port as to whether they are actually using an
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.Ar xterm
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terminal.
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.Pp
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No whitespace characters are permitted in the
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.Fl m
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option argument.
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Also, to avoid problems with metacharacters, it is suggested that the entire
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.Fl m
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option argument be placed within single quote characters, and that
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.Nm csh
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users insert a backslash character (``\e'') before any exclamation
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marks (``!'').
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.Sh ENVIRONMENT
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The
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.Nm
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command utilizes the
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.Ev SHELL
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and
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.Ev TERM
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environment variables.
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.Sh FILES
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.Bl -tag -width /usr/share/misc/termcap -compact
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.It Pa /etc/ttys
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system port name to terminal type mapping database
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.It Pa /usr/share/misc/termcap
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terminal capability database
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.El
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.Sh COMPATIBILITY
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The
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.Fl A ,
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.Fl E ,
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.Fl h ,
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.Fl u
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and
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.Fl v
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options have been deleted from the
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.Nm
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utility.
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None of them were documented in
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.Bx 4.3
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and all are of limited utility at
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best.
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The
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.Fl a ,
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.Fl d
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and
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.Fl p
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options are similarly not documented or useful, but were retained as they
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appear to be in widespread use.
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It is strongly recommended that any usage of these three options be
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changed to use the
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.Fl m
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option instead.
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The
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.Fl n
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option remains, but has no effect.
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It is still permissible to specify the
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.Fl e ,
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.Fl i
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and
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.Fl k
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options without arguments, although it is strongly recommended that such
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usage be fixed to explicitly specify the character.
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.Pp
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Executing
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.Nm
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as
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.Nm reset
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no longer implies the
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.Fl Q
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option.
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Also, the interaction between the
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.Fl
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option and the
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.Ar terminal
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argument in some historic implementations of
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.Nm
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has been removed.
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.Pp
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Finally, the
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.Nm
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implementation has been completely redone (as part of the addition to the
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system of a
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.St -p1003.1-88
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compliant terminal interface) and will no longer compile on systems with
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older terminal interfaces.
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.Sh SEE ALSO
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.Xr csh 1 ,
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.Xr sh 1 ,
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.Xr stty 1 ,
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.Xr tty 4 ,
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.Xr termcap 5 ,
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.Xr ttys 5 ,
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.Xr environ 7
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.Sh HISTORY
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The
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.Nm
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and
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.Nm reset
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utilities first appeared in
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.Bx 1 .
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.Sh AUTHORS
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.An -nosplit
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The original version of
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.Nm tset
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was written by
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.An Eric P. Allman
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in October 1977, and
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.Nm reset
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was originally written by
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.An Kurt Shoens .
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The current version also contains code by
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.An Zeyd M. Ben-Halim ,
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.An Eric S. Raymond ,
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and
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.An Thomas E. Dickey .
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