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35 .\" @(#)stty.1 8.4 (Berkeley) 4/18/94
36 .\" $FreeBSD: src/bin/stty/stty.1,v 1.13.2.6 2001/12/14 14:22:09 ru Exp $
37 .\" $DragonFly: src/bin/stty/stty.1,v 1.4 2006/02/10 19:01:09 swildner Exp $
44 .Nd set the options for a terminal device interface
47 .Op Fl a | Fl e | Fl g
53 utility sets or reports on terminal
54 characteristics for the device that is its standard input.
55 If no options or operands are specified, it reports the settings of a subset
56 of characteristics as well as additional ones if they differ from their
59 the terminal state according to the specified arguments.
60 Some combinations of arguments are mutually
61 exclusive on some terminal types.
63 The following options are available:
64 .Bl -tag -width indent
66 Display all the current settings for the terminal to standard output
70 Display all the current settings for the terminal to standard output
73 ``all'' and ``everything'' formats.
75 Open and use the terminal named by
77 rather than using standard input. The file is opened
83 set or display settings on a terminal that might otherwise
86 Display all the current settings for the terminal to standard output
87 in a form that may be used as an argument to a subsequent invocation of
89 to restore the current terminal state as per
93 The following arguments are available to set the terminal
96 Control mode flags affect hardware characteristics associated with the
97 terminal. This corresponds to the c_cflag in the termios structure.
99 .It Cm parenb Pq Fl parenb
100 Enable (disable) parity generation
102 .It Cm parodd Pq Fl parodd
103 Select odd (even) parity.
104 .It Cm cs5 cs6 cs7 cs8
105 Select character size, if possible.
107 Set terminal baud rate to the
108 number given, if possible.
110 baud rate is set to zero, modem
113 .It Cm ispeed Ar number
114 Set terminal input baud rate to the
115 number given, if possible.
117 input baud rate is set to zero, the
118 input baud rate is set to the
119 value of the output baud
121 .It Cm ospeed Ar number
122 Set terminal output baud rate to
123 the number given, if possible.
125 the output baud rate is set to
126 zero, modem control is
128 .It Cm speed Ar number
135 .It Cm hupcl Pq Fl hupcl
136 Stop asserting modem control
137 (do not stop asserting modem control) on last close.
141 .It Cm cstopb Pq Fl cstopb
142 Use two (one) stop bits per character.
143 .It Cm cread Pq Fl cread
144 Enable (disable) the receiver.
145 .It Cm clocal Pq Fl clocal
146 Assume a line without (with) modem
148 .It Cm crtscts Pq Fl crtscts
149 Enable (disable) RTS/CTS flow control.
152 This corresponds to the c_iflag in the termios structure.
154 .It Cm ignbrk Pq Fl ignbrk
155 Ignore (do not ignore) break on
157 .It Cm brkint Pq Fl brkint
158 Signal (do not signal)
162 .It Cm ignpar Pq Fl ignpar
163 Ignore (do not ignore) characters with parity
165 .It Cm parmrk Pq Fl parmrk
166 Mark (do not mark) characters with parity errors.
167 .It Cm inpck Pq Fl inpck
168 Enable (disable) input parity
170 .It Cm istrip Pq Fl istrip
171 Strip (do not strip) input characters
173 .It Cm inlcr Pq Fl inlcr
179 .It Cm igncr Pq Fl igncr
180 Ignore (do not ignore)
183 .It Cm icrnl Pq Fl icrnl
189 .It Cm ixon Pq Fl ixon
194 Output from the system is
195 stopped when the system receives
197 and started when the system
202 is set, any character restarts output.
203 .It Cm ixoff Pq Fl ixoff
204 Request that the system send (not
208 the input queue is nearly
210 .It Cm ixany Pq Fl ixany
211 Allow any character (allow only
214 .It Cm imaxbel Pq Fl imaxbel
215 The system imposes a limit of
217 (currently 255) characters in the input queue. If
219 is set and the input queue limit has been reached,
220 subsequent input causes the system to send an ASCII BEL
221 character to the output queue (the terminal beeps at you). Otherwise,
224 is unset and the input queue is full, the next input character causes
225 the entire input and output queues to be discarded.
228 This corresponds to the c_oflag of the termios structure.
230 .It Cm opost Pq Fl opost
231 Post-process output (do not
232 post-process output; ignore all other
234 .It Cm onlcr Pq Fl onlcr
240 .It Cm ocrnl Pq Fl ocrnl
246 .It Cm oxtabs Pq Fl oxtabs
247 Expand (do not expand) tabs to spaces on output.
248 .It Cm onocr Pq Fl onocr
249 Do not (do) output CRs at column zero.
250 .It Cm onlret Pq Fl onlret
251 On the terminal NL performs (does not perform) the CR function.
254 Local mode flags (lflags) affect various and sundry characteristics of terminal
256 Historically the term "local" pertained to new job control features
257 implemented by Jim Kulp on a
261 Later the driver ran on the first
263 at Evans Hall, UC Berkeley, where the job control details
264 were greatly modified but the structure definitions and names
265 remained essentially unchanged.
266 The second interpretation of the 'l' in lflag
267 is ``line discipline flag'' which corresponds to the
273 .It Cm isig Pq Fl isig
274 Enable (disable) the checking of
275 characters against the special control
280 .It Cm icanon Pq Fl icanon
281 Enable (disable) canonical input
286 .It Cm iexten Pq Fl iexten
287 Enable (disable) any implementation
288 defined special control characters
289 not currently controlled by icanon,
291 .It Cm echo Pq Fl echo
292 Echo back (do not echo back) every
294 .It Cm echoe Pq Fl echoe
297 character shall (shall
298 not) visually erase the last character
299 in the current line from the
300 display, if possible.
301 .It Cm echok Pq Fl echok
307 .It Cm echoke Pq Fl echoke
310 character shall (shall
311 not) visually erase the
312 current line from the
313 display, if possible.
314 .It Cm echonl Pq Fl echonl
319 .It Cm echoctl Pq Fl echoctl
322 is set, echo control characters as ^X. Otherwise control characters
324 .It Cm echoprt Pq Fl echoprt
325 For printing terminals.
326 If set, echo erased characters backwards within ``\\''
327 and ``/''. Otherwise, disable this feature.
328 .It Cm noflsh Pq Fl noflsh
329 Disable (enable) flush after
330 .Dv INTR , QUIT , SUSP .
331 .It Cm tostop Pq Fl tostop
334 for background output. This causes background jobs to stop if they attempt
336 .It Cm altwerase Pq Fl altwerase
337 Use (do not use) an alternate word erase algorithm when processing
340 This alternate algorithm considers sequences of
341 alphanumeric/underscores as words.
342 It also skips the first preceding character in its classification
343 (as a convenience since the one preceding character could have been
344 erased with simply an
347 .It Cm mdmbuf Pq Fl mdmbuf
348 If set, flow control output based on condition of Carrier Detect. Otherwise
349 writes return an error if Carrier Detect is low (and Carrier is not being
353 .It Cm flusho Pq Fl flusho
354 Indicates output is (is not) being discarded.
355 .It Cm pendin Pq Fl pendin
356 Indicates input is (is not) pending after a switch from non-canonical
357 to canonical mode and will be re-input when a read becomes pending
358 or more input arrives.
360 .Ss Control Characters:
362 .It Ar control-character Ar string
364 .Ar control-character
367 If string is a single character,
368 the control character is set to
371 two character sequence "^-" or the
372 string "undef" the control character
373 is disabled (i.e. set to
374 .Pf { Dv _POSIX_VDISABLE Ns } . )
376 Recognized control-characters:
377 .Bd -ragged -offset indent
378 .Bl -column character Subscript
380 .It character Ta Subscript Ta Description
381 .It _________ Ta _________ Ta _______________
382 .It eof Ta Tn VEOF Ta EOF No character
383 .It eol Ta Tn VEOL Ta EOL No character
384 .It eol2 Ta Tn VEOL2 Ta EOL2 No character
385 .It erase Ta Tn VERASE Ta ERASE No character
386 .It erase2 Ta Tn VERASE2 Ta ERASE2 No character
387 .It werase Ta Tn VWERASE Ta WERASE No character
388 .It intr Ta Tn VINTR Ta INTR No character
389 .It kill Ta Tn VKILL Ta KILL No character
390 .It quit Ta Tn VQUIT Ta QUIT No character
391 .It susp Ta Tn VSUSP Ta SUSP No character
392 .It start Ta Tn VSTART Ta START No character
393 .It stop Ta Tn VSTOP Ta STOP No character
394 .It dsusp Ta Tn VDSUSP Ta DSUSP No character
395 .It lnext Ta Tn VLNEXT Ta LNEXT No character
396 .It reprint Ta Tn VREPRINT Ta REPRINT No character
397 .It status Ta Tn VSTATUS Ta STATUS No character
398 .It ckpt Ta Tn VCHECKPT Ta CKPT No character
402 .It Cm time Ar number
403 Set the value of min or time to
409 Non-Canonical mode input processing
412 .Ss Combination Modes:
414 .It Ar saved settings
415 Set the current terminal
416 characteristics to the saved settings
420 .It Cm evenp No or Cm parity
421 Enable parenb and cs7; disable
424 Enable parenb, cs7, and parodd.
425 .It Fl parity , evenp , oddp
426 Disable parenb, and set cs8.
427 .It Cm \&nl Pq Fl \&nl
428 Enable (disable) icrnl.
430 -nl unsets inlcr and igncr.
438 back to system defaults.
440 Resets all modes to reasonable values for interactive terminal use.
442 Set the line discipline to the standard terminal line discipline
445 Set (disable) all modes suitable for a CRT display device.
446 .It Cm kerninfo Pq Fl kerninfo
447 Enable (disable) the system generated status line associated with
450 character (usually set to ^T). The status line consists of the
451 system load average, the current command name, its process ID, the
452 event the process is waiting on (or the status of the process), the user
453 and system times, percent cpu, and current memory usage.
454 .It Cm columns Ar number
455 The terminal size is recorded as having
458 .It Cm cols Ar number
461 .It Cm rows Ar number
462 The terminal size is recorded as having
466 Set modes suitable for users of Digital Equipment Corporation systems
471 characters are set to ^?, ^U, and ^C;
476 .It Cm extproc Pq Fl extproc
477 If set, this flag indicates that some amount of terminal processing is being
478 performed by either the terminal hardware or by the remote side connected
481 If set, change the modes of the terminal so that no input or output processing
483 If unset, change the modes of the terminal to some reasonable
484 state that performs input and output processing. Note that since the
485 terminal driver no longer has a single
487 bit, it is not possible to intuit what flags were set prior to setting
489 This means that unsetting
491 may not put back all the setting that were previously in effect.
492 To set the terminal into a raw state and then accurately restore it, the following
493 shell code is recommended:
495 save_state=$(stty -g)
501 The size of the terminal is printed as two numbers on a single line,
502 first rows, then columns.
504 .Ss Compatibility Modes:
505 These modes remain for compatibility with the previous version of
511 Reports all the terminal modes as with
513 except that the control characters are printed in a columnar format.
522 .Cm brkint , ixon , imaxbel , opost ,
534 .It Cm newcrt Pq Fl newcrt
540 .It Cm tandem Pq Fl tandem
543 .It Cm decctlq Pq Fl decctlq
546 .It Cm crterase Pq Fl crterase
549 .It Cm crtbs Pq Fl crtbs
552 .It Cm crtkill Pq Fl crtkill
555 .It Cm ctlecho Pq Fl ctlecho
558 .It Cm prterase Pq Fl prterase
561 .It Cm litout Pq Fl litout
564 .It Cm tabs Pq Fl tabs
568 Same as the control character
570 .It Cm flush Ar value
571 Same as the control character
573 .It Cm rprnt Ar value
574 Same as the control character
584 utility is expected to be
586 compatible. The flags
591 extensions to the standard.