251 lines
11 KiB
Groff
251 lines
11 KiB
Groff
.\"***************************************************************************
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.\" Copyright (c) 1998,2000 Free Software Foundation, Inc. *
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.\" *
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.\" Permission is hereby granted, free of charge, to any person obtaining a *
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.\" copy of this software and associated documentation files (the *
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.\" "Software"), to deal in the Software without restriction, including *
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.\" without limitation the rights to use, copy, modify, merge, publish, *
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.\" distribute, distribute with modifications, sublicense, and/or sell *
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.\" copies of the Software, and to permit persons to whom the Software is *
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.\" furnished to do so, subject to the following conditions: *
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.\" *
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.\" The above copyright notice and this permission notice shall be included *
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.\" in all copies or substantial portions of the Software. *
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.\" *
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.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
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.\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
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.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
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.\" IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
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.\" DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
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.\" OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
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.\" THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
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.\" *
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.\" Except as contained in this notice, the name(s) of the above copyright *
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.\" holders shall not be used in advertising or otherwise to promote the *
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.\" sale, use or other dealings in this Software without prior written *
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.\" authorization. *
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.\"***************************************************************************
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.\"
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.\" $Id: tset.1,v 1.12 2000/09/09 20:33:07 tom Exp $
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.TH tset 1 ""
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.SH NAME
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\fBtset\fR, \fBreset\fR - terminal initialization
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.SH SYNOPSIS
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tset [-IQVqrs] [-] [-e \fIch\fR] [-i \fIch\fR] [-k \fIch\fR] [-m \fImapping\fR] [\fIterminal\fR]
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.br
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reset [-IQVqrs] [-] [-e \fIch\fR] [-i \fIch\fR] [-k \fIch\fR] [-m \fImapping\fR] [\fIterminal\fR]
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.SH DESCRIPTION
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\&\fBTset\fR initializes terminals.
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\fBTset\fR 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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1. The \fBterminal\fR argument specified on the command line.
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.PP
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2. The value of the \fBTERM\fR environmental variable.
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.PP
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3. (BSD systems only.) The terminal type associated with the standard
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error output device in the \fI/etc/ttys\fR file. (On Linux and
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System-V-like UNIXes, \fIgetty\fR does this job by setting
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\fBTERM\fR according to the type passed to it by \fI/etc/inittab\fR.)
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.PP
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4. The default terminal type, ``unknown''.
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.PP
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If the terminal type was not specified on the command-line, the -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
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user is prompted for confirmation of the terminal type. An empty
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response confirms the type, or, another type can be entered to specify
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a new type. Once the terminal type has been determined, the terminfo
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entry for the terminal is retrieved. If no terminfo entry is found
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for the type, the user is prompted for another terminal type.
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.PP
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Once the terminfo 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 \fBreset\fR, \fBtset\fR sets cooked and echo modes,
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turns off cbreak and raw modes, turns on newline translation and
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resets any unset special characters to their default values before
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doing the terminal initialization described above. This is useful
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after a program dies leaving a terminal in an abnormal state. Note,
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you may have to type
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\fB<LF>reset<LF>\fR
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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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.TP 5
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-q
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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. The option `-' by itself is equivalent but
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archaic.
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.TP 5
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-e
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Set the erase character to \fIch\fR.
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.TP 5
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-I
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Do not send the terminal or tab initialization strings to the terminal.
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.TP 5
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-Q
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Don't display any values for the erase, interrupt and line kill characters.
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.TP
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\fB-V\fR
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reports the version of ncurses which was used in this program, and exits.
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.TP 5
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-i
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Set the interrupt character to \fIch\fR.
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.TP 5
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-k
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Set the line kill character to \fIch\fR.
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.TP 5
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-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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.TP 5
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-r
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Print the terminal type to the standard error output.
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.TP 5
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-s
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Print the sequence of shell commands to initialize the environment variable
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\fBTERM\fR to the standard output.
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See the section below on setting the environment for details.
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.PP
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The arguments for the -e, -i, and -k
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options may either be entered as actual characters or by using the `hat'
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notation, i.e. control-h may be specified as ``^H'' or ``^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 -s option.
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.PP
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When the -s option is specified, the commands to enter the information
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into the shell's environment are written to the standard output. If
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the \fBSHELL\fR environmental variable ends in ``csh'', the commands
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are for \fBcsh\fR, otherwise, they are for \fBsh\fR.
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Note, the \fBcsh\fR commands set and unset the shell variable
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\fBnoglob\fR, leaving it unset. The following line in the \fB.login\fR
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or \fB.profile\fR files will initialize the environment correctly:
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eval \`tset -s options ... \`
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.SH TERMINAL TYPE MAPPING
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When the terminal is not hardwired into the system (or the current
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system information is incorrect) the terminal type derived from the
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\fI/etc/ttys\fR file or the \fBTERM\fR environmental variable is often
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something generic like \fBnetwork\fR, \fBdialup\fR, or \fBunknown\fR.
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When \fBtset\fR is used in a startup script it is often desirable to
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provide information about the type of terminal used on such ports.
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.PP
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The purpose of the -m option is to map
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from some set of conditions to a terminal type, that is, to
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tell \fBtset\fR
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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 -m option consists of an optional port type, an
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optional operator, an optional baud rate specification, an optional
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colon (``:'') character and a terminal type. The port type is a
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string (delimited by either the operator or the colon character). The
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operator may be any combination of ``>'', ``<'', ``@'', and ``!''; ``>''
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means greater than, ``<'' means less than, ``@'' means equal to
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and ``!'' 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 -m
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mappings are applied to the terminal type. If the port type and baud
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rate match the mapping, the terminal type specified in the mapping
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replaces the current type. If more than one mapping is specified, the
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first applicable mapping is used.
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.PP
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For example, consider the following mapping: \fBdialup>9600:vt100\fR.
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The port type is dialup , the operator is >, the baud rate
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specification is 9600, and the terminal type is vt100. The result of
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this mapping is to specify that if the terminal type is \fBdialup\fR,
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and the baud rate is greater than 9600 baud, a terminal type of
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\fBvt100\fR will be used.
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.PP
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If no baud rate is specified, the terminal type will match any baud rate.
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If no port type is specified, the terminal type will match any port type.
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For example, \fB-m dialup:vt100 -m :?xterm\fR
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will cause any dialup port, regardless of baud rate, to match the terminal
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type vt100, and any non-dialup port type to match the terminal type ?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 xterm
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terminal.
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.PP
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No whitespace characters are permitted in the -m option argument.
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Also, to avoid problems with meta-characters, it is suggested that the
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entire -m option argument be placed within single quote characters,
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and that \fBcsh\fR users insert a backslash character (``\e'') before
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any exclamation marks (``!'').
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.SH HISTORY
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The \fBtset\fR command appeared in BSD 3.0. The \fBncurses\fR implementation
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was lightly adapted from the 4.4BSD sources for a terminfo environment by Eric
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S. Raymond <esr@snark.thyrsus.com>.
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.SH COMPATIBILITY
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The \fBtset\fR utility has been provided for backward-compatibility with BSD
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environments (under most modern UNIXes, \fB/etc/inittab\fR and \fIgetty\fR(1)
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can set \fBTERM\fR appropriately for each dial-up line; this obviates what was
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\fBtset\fR's most important use). This implementation behaves like 4.4BSD
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tset, with a few exceptions specified here.
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.PP
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The -S option of BSD tset no longer works; it prints an error message to stderr
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and dies. The -s option only sets \fBTERM\fR, not \fBTERMCAP\fP. Both these
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changes are because the \fBTERMCAP\fR variable is no longer supported under
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terminfo-based \fBncurses\fR, which makes \fBtset -S\fR useless (we made it die
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noisily rather than silently induce lossage).
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.PP
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There was an undocumented 4.4BSD feature that invoking tset via a link named
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`TSET` (or via any other name beginning with an upper-case letter) set the
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terminal to use upper-case only. This feature has been omitted.
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.PP
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The -A, -E, -h, -u and -v options were deleted from the \fBtset\fR
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utility in 4.4BSD. None of them were documented in 4.3BSD and all are
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of limited utility at best. The -a, -d, and -p options are similarly
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not documented or useful, but were retained as they appear to be in
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widespread use. It is strongly recommended that any usage of these
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three options be changed to use the -m option instead. The
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-n option remains, but has no effect. The -adnp options are therefore
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omitted from the usage summary above.
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.PP
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It is still permissible to specify the -e, -i, and -k options without
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arguments, although it is strongly recommended that such usage be fixed to
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explicitly specify the character.
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.PP
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As of 4.4BSD, executing \fBtset\fR as \fBreset\fR no longer implies the -Q
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option. Also, the interaction between the - option and the \fIterminal\fR
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argument in some historic implementations of \fBtset\fR has been removed.
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.SH ENVIRONMENT
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The \fBtset\fR command uses the \fBSHELL\fR and \fBTERM\fR
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environment variables.
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.SH FILES
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.TP 5
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/etc/ttys
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system port name to terminal type mapping database (BSD versions only).
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.TP 5
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@TERMINFO@
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terminal capability database
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.SH SEE ALSO
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csh(1),
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sh(1),
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stty(1),
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tty(4),
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termcap(5),
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ttys(5),
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environ(7)
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.\"#
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.\"# The following sets edit modes for GNU EMACS
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.\"# Local Variables:
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.\"# mode:nroff
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.\"# fill-column:79
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.\"# End:
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