584 lines
15 KiB
Groff
584 lines
15 KiB
Groff
.\" Copyright (c) 1990, 1993, 1994
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" the Institute of Electrical and Electronics Engineers, Inc.
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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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.\" @(#)stty.1 8.4 (Berkeley) 4/18/94
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.\" $FreeBSD$
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.\"
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.Dd April 18, 1994
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.Dt STTY 1
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.Os
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.Sh NAME
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.Nm stty
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.Nd set the options for a terminal device interface
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.Sh SYNOPSIS
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.Nm stty
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.Op Fl a | Fl e | Fl g
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.Op Fl f Ar file
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.Op operands
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.Sh DESCRIPTION
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The
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.Nm
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utility sets or reports on terminal
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characteristics for the device that is its standard input.
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If no options or operands are specified, it reports the settings of a subset
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of characteristics as well as additional ones if they differ from their
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default values.
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Otherwise it modifies
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the terminal state according to the specified arguments.
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Some combinations of arguments are mutually
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exclusive on some terminal types.
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.Pp
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The following options are available:
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.Bl -tag -width indent
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.It Fl a
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Display all the current settings for the terminal to standard output
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as per
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.St -p1003.2 .
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.It Fl e
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Display all the current settings for the terminal to standard output
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in the traditional
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.Tn BSD
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``all'' and ``everything'' formats.
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.It Fl f
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Open and use the terminal named by
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.Ar file
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rather than using standard input. The file is opened
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using the
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.Dv O_NONBLOCK
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flag of
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.Fn open ,
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making it possible to
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set or display settings on a terminal that might otherwise
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block on the open.
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.It Fl g
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Display all the current settings for the terminal to standard output
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in a form that may be used as an argument to a subsequent invocation of
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.Nm
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to restore the current terminal state as per
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.St -p1003.2 .
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.El
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.Pp
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The following arguments are available to set the terminal
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characteristics:
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.Ss Control Modes:
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.Pp
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Control mode flags affect hardware characteristics associated with the
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terminal. This corresponds to the c_cflag in the termios structure.
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.Bl -tag -width Fl
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.It Cm parenb Pq Fl parenb
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Enable (disable) parity generation
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and detection.
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.It Cm parodd Pq Fl parodd
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Select odd (even) parity.
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.It Cm cs5 cs6 cs7 cs8
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Select character size, if possible.
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.It Ar number
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Set terminal baud rate to the
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number given, if possible.
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If the
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baud rate is set to zero, modem
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control is no longer
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asserted.
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.It Cm ispeed Ar number
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Set terminal input baud rate to the
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number given, if possible.
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If the
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input baud rate is set to zero, the
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input baud rate is set to the
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value of the output baud
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rate.
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.It Cm ospeed Ar number
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Set terminal output baud rate to
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the number given, if possible.
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If
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the output baud rate is set to
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zero, modem control is
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no longer asserted.
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.It Cm speed Ar number
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This sets both
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.Cm ispeed
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and
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.Cm ospeed
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to
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.Ar number .
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.It Cm hupcl Pq Fl hupcl
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Stop asserting modem control
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(do not stop asserting modem control) on last close.
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.It Cm hup Pq Fl hup
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Same as hupcl
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.Pq Fl hupcl .
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.It Cm cstopb Pq Fl cstopb
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Use two (one) stop bits per character.
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|
.It Cm cread Pq Fl cread
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Enable (disable) the receiver.
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|
.It Cm clocal Pq Fl clocal
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Assume a line without (with) modem
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control.
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|
.It Cm crtscts Pq Fl crtscts
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Enable (disable) RTS/CTS flow control.
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|
.El
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|
.Ss Input Modes:
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|
This corresponds to the c_iflag in the termios structure.
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.Bl -tag -width Fl
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.It Cm ignbrk Pq Fl ignbrk
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Ignore (do not ignore) break on
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input.
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.It Cm brkint Pq Fl brkint
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Signal (do not signal)
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.Dv INTR
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on
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break.
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.It Cm ignpar Pq Fl ignpar
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Ignore (do not ignore) characters with parity
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errors.
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|
.It Cm parmrk Pq Fl parmrk
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Mark (do not mark) characters with parity errors.
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.It Cm inpck Pq Fl inpck
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Enable (disable) input parity
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checking.
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.It Cm istrip Pq Fl istrip
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Strip (do not strip) input characters
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to seven bits.
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|
.It Cm inlcr Pq Fl inlcr
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Map (do not map)
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.Dv NL
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to
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.Dv CR
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on input.
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.It Cm igncr Pq Fl igncr
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Ignore (do not ignore)
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.Dv CR
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on input.
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.It Cm icrnl Pq Fl icrnl
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Map (do not map)
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.Dv CR
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to
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.Dv NL
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on input.
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.It Cm ixon Pq Fl ixon
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Enable (disable)
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.Dv START/STOP
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output
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control.
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|
Output from the system is
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stopped when the system receives
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.Dv STOP
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and started when the system
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receives
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.Dv START ,
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or if
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.Cm ixany
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is set, any character restarts output.
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.It Cm ixoff Pq Fl ixoff
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Request that the system send (not
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send)
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.Dv START/STOP
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characters when
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the input queue is nearly
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empty/full.
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.It Cm ixany Pq Fl ixany
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Allow any character (allow only
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.Dv START )
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to restart output.
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.It Cm imaxbel Pq Fl imaxbel
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The system imposes a limit of
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.Dv MAX_INPUT
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(currently 255) characters in the input queue. If
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.Cm imaxbel
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is set and the input queue limit has been reached,
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|
subsequent input causes the system to send an ASCII BEL
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character to the output queue (the terminal beeps at you). Otherwise,
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if
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.Cm imaxbel
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is unset and the input queue is full, the next input character causes
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the entire input and output queues to be discarded.
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.El
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|
.Ss Output Modes:
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This corresponds to the c_oflag of the termios structure.
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.Bl -tag -width Fl
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.It Cm opost Pq Fl opost
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Post-process output (do not
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post-process output; ignore all other
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output modes).
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|
.It Cm onlcr Pq Fl onlcr
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Map (do not map)
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.Dv NL
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to
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.Dv CR-NL
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on output.
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.It Cm oxtabs Pq Fl oxtabs
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Expand (do not expand) tabs to spaces on output.
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|
.El
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|
.Ss Local Modes:
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.Pp
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Local mode flags (lflags) affect various and sundry characteristics of terminal
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processing.
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|
Historically the term "local" pertained to new job control features
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implemented by Jim Kulp on a
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.Tn Pdp 11/70
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at
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.Tn IIASA .
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|
Later the driver ran on the first
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.Tn VAX
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at Evans Hall, UC Berkeley, where the job control details
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were greatly modified but the structure definitions and names
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|
remained essentially unchanged.
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|
The second interpretation of the 'l' in lflag
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|
is ``line discipline flag'' which corresponds to the
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.Ar c_lflag
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of the
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.Ar termios
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structure.
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|
.Bl -tag -width Fl
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.It Cm isig Pq Fl isig
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|
Enable (disable) the checking of
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|
characters against the special control
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|
characters
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|
.Dv INTR , QUIT ,
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and
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|
.Dv SUSP .
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|
.It Cm icanon Pq Fl icanon
|
|
Enable (disable) canonical input
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|
.Pf ( Dv ERASE
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and
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.Dv KILL
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processing).
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|
.It Cm iexten Pq Fl iexten
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|
Enable (disable) any implementation
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defined special control characters
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|
not currently controlled by icanon,
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isig, or ixon.
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.It Cm echo Pq Fl echo
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|
Echo back (do not echo back) every
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|
character typed.
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|
.It Cm echoe Pq Fl echoe
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|
The
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.Dv ERASE
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character shall (shall
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|
not) visually erase the last character
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|
in the current line from the
|
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display, if possible.
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|
.It Cm echok Pq Fl echok
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Echo (do not echo)
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|
.Dv NL
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after
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.Dv KILL
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character.
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|
.It Cm echoke Pq Fl echoke
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The
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.Dv KILL
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character shall (shall
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|
not) visually erase the
|
|
current line from the
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display, if possible.
|
|
.It Cm echonl Pq Fl echonl
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|
Echo (do not echo)
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|
.Dv NL ,
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even if echo
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is disabled.
|
|
.It Cm echoctl Pq Fl echoctl
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|
If
|
|
.Cm echoctl
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|
is set, echo control characters as ^X. Otherwise control characters
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|
echo as themselves.
|
|
.It Cm echoprt Pq Fl echoprt
|
|
For printing terminals. If set, echo erased characters backwards within ``\\''
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|
and ``/''. Otherwise, disable this feature.
|
|
.It Cm noflsh Pq Fl noflsh
|
|
Disable (enable) flush after
|
|
.Dv INTR , QUIT , SUSP .
|
|
.It Cm tostop Pq Fl tostop
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|
Send (do not send)
|
|
.Dv SIGTTOU
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|
for background output. This causes background jobs to stop if they attempt
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terminal output.
|
|
.It Cm altwerase Pq Fl altwerase
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|
Use (do not use) an alternate word erase algorithm when processing
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|
.Dv WERASE
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characters.
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|
This alternate algorithm considers sequences of
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|
alphanumeric/underscores as words.
|
|
It also skips the first preceding character in its classification
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|
(as a convenience since the one preceding character could have been
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erased with simply an
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|
.Dv ERASE
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character.)
|
|
.It Cm mdmbuf Pq Fl mdmbuf
|
|
If set, flow control output based on condition of Carrier Detect. Otherwise
|
|
writes return an error if Carrier Detect is low (and Carrier is not being
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|
ignored with the
|
|
.Dv CLOCAL
|
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flag.)
|
|
.It Cm flusho Pq Fl flusho
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Indicates output is (is not) being discarded.
|
|
.It Cm pendin Pq Fl pendin
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Indicates input is (is not) pending after a switch from non-canonical
|
|
to canonical mode and will be re-input when a read becomes pending
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|
or more input arrives.
|
|
.El
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|
.Ss Control Characters:
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|
.Bl -tag -width Fl
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.It Ar control-character Ar string
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Set
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.Ar control-character
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to
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.Ar string .
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|
If string is a single character,
|
|
the control character is set to
|
|
that character.
|
|
If string is the
|
|
two character sequence "^-" or the
|
|
string "undef" the control character
|
|
is disabled (i.e. set to
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.Pf { Dv _POSIX_VDISABLE Ns } . )
|
|
.Pp
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|
Recognized control-characters:
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|
.Bd -ragged -offset indent
|
|
.Bl -column character Subscript
|
|
.It control-
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.It character Subscript Description
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.It _________ _________ _______________
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.It eof Ta Tn VEOF EOF No character
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.It eol Ta Tn VEOL EOL No character
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|
.It eol2 Ta Tn VEOL2 EOL2 No character
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|
.It erase Ta Tn VERASE ERASE No character
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|
.It werase Ta Tn VWERASE WERASE No character
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.It intr Ta Tn VINTR INTR No character
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|
.It kill Ta Tn VKILL KILL No character
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.It quit Ta Tn VQUIT QUIT No character
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|
.It susp Ta Tn VSUSP SUSP No character
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|
.It start Ta Tn VSTART START No character
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|
.It stop Ta Tn VSTOP STOP No character
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|
.It dsusp Ta Tn VDSUSP DSUSP No character
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|
.It lnext Ta Tn VLNEXT LNEXT No character
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|
.It reprint Ta Tn VREPRINT REPRINT No character
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|
.It status Ta Tn VSTATUS STATUS No character
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|
.El
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.Ed
|
|
.It Cm min Ar number
|
|
.It Cm time Ar number
|
|
Set the value of min or time to
|
|
number.
|
|
.Dv MIN
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and
|
|
.Dv TIME
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|
are used in
|
|
Non-Canonical mode input processing
|
|
(-icanon).
|
|
.El
|
|
.Ss Combination Modes:
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|
.Pp
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|
.Bl -tag -width Fl
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.It Ar saved settings
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|
Set the current terminal
|
|
characteristics to the saved settings
|
|
produced by the
|
|
.Fl g
|
|
option.
|
|
.It Cm evenp No or Cm parity
|
|
Enable parenb and cs7; disable
|
|
parodd.
|
|
.It Cm oddp
|
|
Enable parenb, cs7, and parodd.
|
|
.It Fl parity , evenp , oddp
|
|
Disable parenb, and set cs8.
|
|
.It Cm \&nl Pq Fl \&nl
|
|
Enable (disable) icrnl.
|
|
In addition
|
|
-nl unsets inlcr and igncr.
|
|
.It Cm ek
|
|
Reset
|
|
.Dv ERASE
|
|
and
|
|
.Dv KILL
|
|
characters
|
|
back to system defaults.
|
|
.It Cm sane
|
|
Resets all modes to reasonable values for interactive terminal use.
|
|
.It Cm tty
|
|
Set the line discipline to the standard terminal line discipline
|
|
.Dv TTYDISC .
|
|
.It Cm crt Pq Fl crt
|
|
Set (disable) all modes suitable for a CRT display device.
|
|
.It Cm kerninfo Pq Fl kerninfo
|
|
Enable (disable) the system generated status line associated with
|
|
processing a
|
|
.Dv STATUS
|
|
character (usually set to ^T). The status line consists of the
|
|
system load average, the current command name, its process ID, the
|
|
event the process is waiting on (or the status of the process), the user
|
|
and system times, percent cpu, and current memory usage.
|
|
.It Cm columns Ar number
|
|
The terminal size is recorded as having
|
|
.Ar number
|
|
columns.
|
|
.It Cm cols Ar number
|
|
is an alias for
|
|
.Cm columns.
|
|
.It Cm rows Ar number
|
|
The terminal size is recorded as having
|
|
.Ar number
|
|
rows.
|
|
.It Cm dec
|
|
Set modes suitable for users of Digital Equipment Corporation systems (
|
|
.Dv ERASE ,
|
|
.Dv KILL ,
|
|
and
|
|
.Dv INTR
|
|
characters are set to ^?, ^U, and ^C;
|
|
.Dv ixany
|
|
is disabled, and
|
|
.Dv crt
|
|
is enabled.)
|
|
.It Cm extproc Pq Fl extproc
|
|
If set, this flag indicates that some amount of terminal processing is being
|
|
performed by either the terminal hardware or by the remote side connected
|
|
to a pty.
|
|
.It Cm raw Pq Fl raw
|
|
If set, change the modes of the terminal so that no input or output processing
|
|
is performed. If unset, change the modes of the terminal to some reasonable
|
|
state that performs input and output processing. Note that since the
|
|
terminal driver no longer has a single
|
|
.Dv RAW
|
|
bit, it is not possible to intuit what flags were set prior to setting
|
|
.Cm raw .
|
|
This means that unsetting
|
|
.Cm raw
|
|
may not put back all the setting that were previously in effect.
|
|
To set the terminal into a raw state and then accurately restore it, the following
|
|
shell code is recommended:
|
|
.nf
|
|
|
|
save_state=$(stty -g)
|
|
stty raw
|
|
\&...
|
|
stty "$save_state"
|
|
|
|
.fi
|
|
.It Cm size
|
|
The size of the terminal is printed as two numbers on a single line,
|
|
first rows, then columns.
|
|
.El
|
|
.Ss Compatibility Modes:
|
|
.Pp
|
|
These modes remain for compatibility with the previous version of
|
|
the
|
|
.Nm
|
|
command.
|
|
.Bl -tag -width Fl
|
|
.It Cm all
|
|
Reports all the terminal modes as with
|
|
.Cm stty Fl a
|
|
except that the control characters are printed in a columnar format.
|
|
.It Cm everything
|
|
Same as
|
|
.Cm all .
|
|
.It Cm cooked
|
|
Same as
|
|
.Cm sane .
|
|
.It Cm cbreak
|
|
If set, enables
|
|
.Cm brkint , ixon , imaxbel , opost ,
|
|
.Cm isig , iexten ,
|
|
and
|
|
.Cm Fl icanon .
|
|
If unset, same as
|
|
.Cm sane .
|
|
.It Cm new
|
|
Same as
|
|
.Cm tty .
|
|
.It Cm old
|
|
Same as
|
|
.Cm tty .
|
|
.It Cm newcrt Pq Fl newcrt
|
|
Same as
|
|
.Cm crt .
|
|
.It Cm pass8
|
|
The converse of
|
|
.Cm parity .
|
|
.It Cm tandem Pq Fl tandem
|
|
Same as
|
|
.Cm ixoff .
|
|
.It Cm decctlq Pq Fl decctlq
|
|
The converse of
|
|
.Cm ixany .
|
|
.It Cm crterase Pq Fl crterase
|
|
Same as
|
|
.Cm echoe .
|
|
.It Cm crtbs Pq Fl crtbs
|
|
Same as
|
|
.Cm echoe .
|
|
.It Cm crtkill Pq Fl crtkill
|
|
Same as
|
|
.Cm echoke .
|
|
.It Cm ctlecho Pq Fl ctlecho
|
|
Same as
|
|
.Cm echoctl .
|
|
.It Cm prterase Pq Fl prterase
|
|
Same as
|
|
.Cm echoprt .
|
|
.It Cm litout Pq Fl litout
|
|
The converse of
|
|
.Cm opost .
|
|
.It Cm tabs Pq Fl tabs
|
|
The converse of
|
|
.Cm oxtabs .
|
|
.It Cm brk Ar value
|
|
Same as the control character
|
|
.Cm eol .
|
|
.It Cm flush Ar value
|
|
Same as the control character
|
|
.Cm discard .
|
|
.It Cm rprnt Ar value
|
|
Same as the control character
|
|
.Cm reprint .
|
|
.El
|
|
.Sh DIAGNOSTICS
|
|
The
|
|
.Nm
|
|
utility exits 0 on success, and >0 if an error occurs.
|
|
.Sh SEE ALSO
|
|
.Xr termios 4
|
|
.Sh STANDARDS
|
|
The
|
|
.Nm
|
|
function is expected to be
|
|
.St -p1003.2
|
|
compatible. The flags
|
|
.Fl e
|
|
and
|
|
.Fl f
|
|
are
|
|
extensions to the standard.
|