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
609 lines
15 KiB
Groff
609 lines
15 KiB
Groff
.\"-
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.\" 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. 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 October 5, 2016
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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
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.Op Fl a | e | g
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.Op Fl f Ar file
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.Op Ar arguments
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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 arguments 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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.Bx
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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.
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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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Control mode flags affect hardware characteristics associated with the
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terminal.
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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.
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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).
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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 ocrnl Pq Fl ocrnl
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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 output.
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.It Cm tab0 tab3
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Select tab expansion policy.
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.Cm tab0
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disables tab expansion, while
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.Cm tab3
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enables it.
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.It Cm onocr Pq Fl onocr
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Do not (do) output CRs at column zero.
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.It Cm onlret Pq Fl onlret
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On the terminal NL performs (does not perform) the CR function.
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.El
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.Ss Local Modes:
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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
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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
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current line from the
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display, if possible.
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.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.
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.It Cm echoctl Pq Fl echoctl
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If
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.Cm echoctl
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is set, echo control characters as ^X.
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Otherwise control characters
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echo as themselves.
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.It Cm echoprt Pq Fl echoprt
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For printing terminals.
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If set, echo erased characters backwards within ``\\''
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and ``/''.
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Otherwise, disable this feature.
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.It Cm noflsh Pq Fl noflsh
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Disable (enable) flush after
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.Dv INTR , QUIT , SUSP .
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.It Cm tostop Pq Fl tostop
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Send (do not send)
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.Dv SIGTTOU
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for background output.
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This causes background jobs to stop if they attempt
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terminal output.
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.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.
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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.)
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.It Cm mdmbuf Pq Fl mdmbuf
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If set, flow control output based on condition of Carrier Detect.
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Otherwise
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writes return an error if Carrier Detect is low (and Carrier is not being
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ignored with the
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.Dv CLOCAL
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flag.)
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.It Cm flusho Pq Fl flusho
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Indicates output is (is not) being discarded.
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.It Cm pendin Pq Fl pendin
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Indicates input is (is not) pending after a switch from non-canonical
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to canonical mode and will be re-input when a read becomes pending
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or more input arrives.
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.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,
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the control character is set to
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that character.
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If string is the
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two character sequence "^-" or the
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string "undef" the control character
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is disabled (i.e., set to
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.Pf { Dv _POSIX_VDISABLE Ns } . )
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.Pp
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Recognized control-characters:
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.Bd -ragged -offset indent
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.Bl -column character Subscript
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.It control- Ta \& Ta \&
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.It character Ta Subscript Ta Description
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.It _________ Ta _________ Ta _______________
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.It eof Ta Tn VEOF Ta EOF No character
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.It eol Ta Tn VEOL Ta EOL No character
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.It eol2 Ta Tn VEOL2 Ta EOL2 No character
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.It erase Ta Tn VERASE Ta ERASE No character
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.It erase2 Ta Tn VERASE2 Ta ERASE2 No character
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.It werase Ta Tn VWERASE Ta WERASE No character
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.It intr Ta Tn VINTR Ta INTR No character
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.It kill Ta Tn VKILL Ta KILL No character
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.It quit Ta Tn VQUIT Ta QUIT No character
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.It susp Ta Tn VSUSP Ta SUSP No character
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.It start Ta Tn VSTART Ta START No character
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.It stop Ta Tn VSTOP Ta STOP No character
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.It dsusp Ta Tn VDSUSP Ta DSUSP No character
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.It lnext Ta Tn VLNEXT Ta LNEXT No character
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.It reprint Ta Tn VREPRINT Ta REPRINT No character
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.It status Ta Tn VSTATUS Ta STATUS No character
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.El
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.Ed
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.It Cm min Ar number
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.It Cm time Ar number
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Set the value of min or time to
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number.
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.Dv MIN
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and
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.Dv TIME
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are used in
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Non-Canonical mode input processing
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(-icanon).
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.El
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.Ss Combination Modes:
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.Bl -tag -width Fl
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.It Ar saved settings
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Set the current terminal
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characteristics to the saved settings
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produced by the
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.Fl g
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option.
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.It Cm evenp No or Cm parity
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Enable parenb and cs7; disable
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parodd.
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.It Cm oddp
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Enable parenb, cs7, and parodd.
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.It Fl parity , evenp , oddp
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Disable parenb, and set cs8.
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.It Cm \&nl Pq Fl \&nl
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Enable (disable) icrnl.
|
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In addition
|
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-nl unsets inlcr and igncr.
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.It Cm ek
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|
Reset
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.Dv ERASE ,
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.Dv ERASE2 ,
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and
|
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.Dv KILL
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characters
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back to system defaults.
|
|
.It Cm sane
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|
Resets all modes to reasonable values for interactive terminal use.
|
|
.It Cm tty
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|
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
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|
processing a
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.Dv STATUS
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|
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
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|
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
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|
rows.
|
|
.It Cm dec
|
|
Set modes suitable for users of Digital Equipment Corporation systems
|
|
.Dv ( ERASE ,
|
|
.Dv KILL ,
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|
and
|
|
.Dv INTR
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|
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:
|
|
.Bd -literal
|
|
save_state=$(stty -g)
|
|
stty raw
|
|
\&...
|
|
stty "$save_state"
|
|
.Ed
|
|
.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:
|
|
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 ,
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|
.Cm isig , iexten ,
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|
and
|
|
.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 oxtabs Pq Fl oxtabs
|
|
Expand (do not expand) tabs to spaces on output.
|
|
.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 EXIT STATUS
|
|
.Ex -std
|
|
.Sh SEE ALSO
|
|
.Xr termios 4
|
|
.Sh STANDARDS
|
|
The
|
|
.Nm
|
|
utility is expected to be
|
|
.St -p1003.2
|
|
compatible.
|
|
The flags
|
|
.Fl e
|
|
and
|
|
.Fl f
|
|
are
|
|
extensions to the standard.
|
|
.Sh HISTORY
|
|
A
|
|
.Nm
|
|
command appeared in
|
|
.At v2 .
|