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28 .\" @(#)tset.1 8.1 (Berkeley) 6/9/93
29 .\" $FreeBSD: src/usr.bin/tset/tset.1,v 1.5.2.5 2003/02/24 22:37:42 trhodes Exp $
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38 .Nd terminal initialization
59 utility initializes terminals.
60 It first determines the type of terminal that you are using.
61 This determination is done as follows, using the first terminal type found.
63 .Bl -bullet -compact -offset indent
67 argument specified on the command line.
73 The terminal type associated with the standard error output device in the
77 The default terminal type, ``unknown''.
80 If the terminal type was not specified on the command-line, the
82 option mappings are then applied (see below for more information).
83 Then, if the terminal type begins with a question mark (``?''), the user is
84 prompted for confirmation of the terminal type.
85 An empty response confirms the type, or, another type can be entered to
87 Once the terminal type has been determined, the termcap entry for the terminal
89 If no termcap entry is found for the type, the user is prompted for another
92 Once the termcap entry is retrieved, the window size, backspace, interrupt
93 and line kill characters (among many other things) are set and the terminal
94 and tab initialization strings are sent to the standard error output.
95 Finally, if the erase, interrupt and line kill characters have changed,
96 or are not set to their default values, their values are displayed to the
97 standard error output.
102 sets cooked and echo modes, turns off cbreak and raw modes, turns on
103 newline translation and resets any unset special characters to their
104 default values before doing the terminal initialization described above.
105 This is useful after a program dies leaving a terminal in an abnormal state.
106 Note, you may have to type
108 (the line-feed character is normally control-J) to get the terminal
109 to work, as carriage-return may no longer work in the abnormal state.
110 Also, the terminal will often not echo the command.
112 The options are as follows:
115 The terminal type is displayed to the standard output, and the terminal is
116 not initialized in any way.
118 Set the erase character to
121 Do not send the terminal or tab initialization strings to the terminal.
123 Set the interrupt character to
126 Set the line kill character to
129 Specify a mapping from a port type to a terminal.
130 See below for more information.
132 Don't display any values for the erase, interrupt and line kill characters.
134 Print the terminal type to the standard error output.
136 Print the terminal type and the termcap entry to the standard output.
137 See the section below on setting the environment for details.
139 Print the sequence of shell commands to initialize the environment variables
143 to the standard output.
144 See the section below on setting the environment for details.
147 The arguments for the
152 options may either be entered as actual characters or by using the
154 notation, i.e. control-h may be specified as
158 .Sh SETTING THE ENVIRONMENT
159 It is often desirable to enter the terminal type and information about
160 the terminal's capabilities into the shell's environment.
161 This is done using the
169 option is specified, the terminal type and the termcap entry are written
170 to the standard output, separated by a space and without a terminating
172 This can be assigned to an array by
176 users and then used like any other shell array.
180 option is specified, the commands to enter the information into the
181 shell's environment are written to the standard output.
184 environment variable ends in ``csh'', the commands are for the
186 otherwise, they are for
190 commands set and unset the shell variable
193 The following line in the
197 files will initialize the environment correctly:
198 .Bd -literal -offset indent
199 eval \`tset -s options ... \`
202 To demonstrate a simple use of the
204 option, the following lines in the
206 file have an equivalent effect:
207 .Bd -literal -offset indent
209 set term=(`tset -S options ...`)
211 setenv TERMCAP "$term[2]"
215 .Sh TERMINAL TYPE MAPPING
216 When the terminal is not hardwired into the system (or the current system
217 information is incorrect) the terminal type derived from the
221 environment variable is often something generic like
228 is used in a startup script
236 users) it is often desirable to provide information about the type of
237 terminal used on such ports.
242 from some set of conditions to a terminal type, that is, to
245 ``If I'm on this port at a particular speed, guess that I'm on that
250 option consists of an optional port type, an optional operator, an optional
251 baud rate specification, an optional colon (``:'') character and a terminal
253 The port type is a string (delimited by either the operator or the colon
255 The operator may be any combination of:
269 inverts the sense of the test.
270 The baud rate is specified as a number and is compared with the speed
271 of the standard error output (which should be the control terminal).
272 The terminal type is a string.
274 If the terminal type is not specified on the command line, the
276 mappings are applied to the terminal type.
277 If the port type and baud rate match the mapping, the terminal type specified
278 in the mapping replaces the current type.
279 If more than one mapping is specified, the first applicable mapping is used.
281 For example, consider the following mapping:
282 .Dq Li dialup>9600:vt100 .
287 the baud rate specification is
289 and the terminal type is
291 The result of this mapping is to specify that if the terminal type is
293 and the baud rate is greater than 9600 baud, a terminal type of
297 If no port type is specified, the terminal type will match any port type,
299 .Dq Li -m dialup:vt100 -m :?xterm
300 will cause any dialup port, regardless of baud rate, to match the terminal
303 and any non-dialup port type to match the terminal type
305 Note, because of the leading question mark, the user will be
306 queried on a default port as to whether they are actually using an
310 No whitespace characters are permitted in the
313 Also, to avoid problems with metacharacters, it is suggested that the entire
315 option argument be placed within single quote characters, and that
317 users insert a backslash character (``\e'') before any exclamation
326 environment variables.
328 .Bl -tag -width /usr/share/misc/termcap -compact
330 system port name to terminal type mapping database
331 .It Pa /usr/share/misc/termcap
332 terminal capability database
342 options have been deleted from the
345 None of them were documented in
347 and all are of limited utility at
354 options are similarly not documented or useful, but were retained as they
355 appear to be in widespread use.
356 It is strongly recommended that any usage of these three options be
362 option remains, but has no effect.
363 It is still permissible to specify the
368 options without arguments, although it is strongly recommended that such
369 usage be fixed to explicitly specify the character.
375 no longer implies the
378 Also, the interaction between the
382 argument in some historic implementations of
388 implementation has been completely redone (as part of the addition to the
391 compliant terminal interface) and will no longer compile on systems with
392 older terminal interfaces.