636 lines
16 KiB
Groff
636 lines
16 KiB
Groff
.\" $NetBSD: stty.1,v 1.45 2017/10/30 15:38:52 wiz Exp $
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.\"
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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 8.5 (Berkeley) 6/1/94
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.\"
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.Dd August 15, 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 options for a terminal device interface
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.Sh SYNOPSIS
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.Nm
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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 operand ...
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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 XfXfileXX
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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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.Dq all
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and
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.Dq everything
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formats.
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.It Fl f Ar file
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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 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
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.Fa c_cflag
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of the
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.Xr termios 4
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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
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.Ar number ,
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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
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.Ar number ,
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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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.Ar number ,
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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 RTS/CTS flow control.
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.It Cm cdtrcts Pq Fl cdtrcts
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Enable DTR/CTS flow control (if supported).
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.El
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.Ss Input Modes
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This corresponds to the
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.Fa c_iflag
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of the
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.Xr termios 4
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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) parity
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errors.
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.It Cm parmrk Pq Fl parmrk
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Mark (do not mark) 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
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.Fa c_oflag
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of the
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.Xr termios 4
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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 oxtabs Pq Fl oxtabs
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Expand (do not expand) tabs to spaces on output.
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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 PDP-11/70 at IIASA.
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Later the driver ran on the first VAX at Evans Hall, UC Berkeley,
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where the job control details were greatly modified but the structure
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definitions and names remained essentially unchanged.
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The second interpretation of the
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.Sq l
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in lflag
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is
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.Dq line discipline flag ,
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which corresponds to the
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.Fa c_lflag
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of the
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.Xr termios 4
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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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.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
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the 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 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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.Dq \e
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and
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.Dq / .
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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 terminal output.
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.It Cm altwerase Pq Fl altwerase
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Use (do not use) an alternative word erase algorithm when processing
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.Dv WERASE
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characters.
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This alternative 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 writes return an error if Carrier Detect is low (and Carrier
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is not being 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 string
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.Ar string .
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If the string is a single character,
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then the control character is set to
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that character.
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If the string is the
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two character sequence "^-" or the
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string "undef", then the control character
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is disabled (i.e., set to
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.Bro Dv _POSIX_VDISABLE Brc ) .
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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 Description
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.It control- Ta "" Ta ""
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.It character Subscript Description
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.It _________ _________ _______________
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.It eof Ta VEOF Ta EOF No character
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.It eol Ta VEOL Ta EOL No character
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.It eol2 Ta VEOL2 Ta EOL2 No character
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.It erase Ta VERASE Ta ERASE No character
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.It werase Ta VWERASE Ta WERASE No character
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.It kill Ta VKILL Ta KILL No character
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.It reprint Ta VREPRINT Ta REPRINT No character
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.It intr Ta VINTR Ta INTR No character
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.It quit Ta VQUIT Ta QUIT No character
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.It susp Ta VSUSP Ta SUSP No character
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.It dsusp Ta VDSUSP Ta DSUSP No character
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.It start Ta VSTART Ta START No character
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.It stop Ta VSTOP Ta STOP No character
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.It lnext Ta VLNEXT Ta LNEXT No character
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.It status Ta VSTATUS Ta STATUS No character
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.It discard Ta VDISCARD Ta DISCARD 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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.Ar 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 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 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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and
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.Dv KILL
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characters back to system defaults.
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.It Cm sane
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Resets all modes to reasonable values for interactive terminal use.
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.It Cm insane
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Sets all modes to random values, which are very likely
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.Pq but not guaranteed
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to be unreasonable for interactive terminal use.
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.It Cm tty
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Set the line discipline to the standard terminal line discipline
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.Dv TTYDISC .
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.It Cm crt Pq Fl crt
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Set (disable) all modes suitable for a CRT display device.
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.It Cm kerninfo Pq Fl kerninfo
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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).
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The status line consists of the
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system load average, the current command name, its process ID, the
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event the process is waiting on (or the status of the process), the user
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and system times, percent CPU, and current memory usage.
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.It Cm cols Ar number
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The terminal size is recorded as having
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.Ar number
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columns.
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.It Cm columns Ar number
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An alias for
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.Cm cols .
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.It Cm rows Ar number
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The terminal size is recorded as having
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.Ar number
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rows.
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.It Cm dec
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Set modes suitable for users of Digital Equipment Corporation systems
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.Dv ( ERASE ,
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.Dv KILL ,
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and
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.Dv INTR
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characters are set to ^?, ^U, and ^C;
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.Dv ixany
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is disabled, and
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.Dv crt
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is enabled).
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.It Cm extproc Pq Fl extproc
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If set, this flag indicates that some amount of terminal processing is being
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performed by either the terminal hardware or by the remote side connected
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to a pty.
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.It Cm raw Pq Fl raw
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If set, change the modes of the terminal so that no input or output processing
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is performed.
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If unset, change the modes of the terminal to some reasonable
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state that performs input and output processing.
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Note that since the terminal driver no longer has a single
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.Dv RAW
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bit, it is not possible to intuit what flags were set prior to setting
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.Cm raw .
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This means that unsetting
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.Cm raw
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may not put back all the setting that were previously in effect.
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|
To set the terminal into a raw state and then accurately restore it, the following
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shell code is recommended:
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.Bd -literal -offset indent
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|
save_state=$(stty -g)
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stty raw
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\&...
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stty "$save_state"
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.Ed
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.It Cm size
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The size of the terminal is printed as two numbers on a single line,
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first rows, then columns.
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.El
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|
.Ss Compatibility Modes
|
|
These modes remain for compatibility with the previous version of
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|
the
|
|
.Nm
|
|
utility.
|
|
.Bl -tag -width Fl
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|
.It Cm all
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|
Reports all the terminal modes as with
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.Cm stty Fl a
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|
except that the control characters are printed in a columnar format.
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.It Cm everything
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|
Same as
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.Cm all .
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.It Cm cooked
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Same as
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.Cm sane .
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.It Cm cbreak
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If set, enables
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.Cm brkint , ixon , imaxbel , opost ,
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|
.Cm isig , iexten ,
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|
and
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|
.Fl icanon .
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|
If unset, same as
|
|
.Cm sane .
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|
.It Cm new
|
|
Same as
|
|
.Cm tty .
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|
.It Cm old
|
|
Same as
|
|
.Cm tty .
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|
.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
|
|
.Ss Control operations
|
|
These operations are not modes, but rather commands to be performed by
|
|
the tty layer.
|
|
.Bl -tag -width Fl
|
|
.It Cm ostart
|
|
Performs a "start output" operation, as normally done by an
|
|
incoming START character when
|
|
.Cm ixon
|
|
is set.
|
|
.It Cm ostop
|
|
Performs a "stop output" operation, as normally done by an
|
|
incoming STOP character when
|
|
.Cm ixon
|
|
is set.
|
|
.El
|
|
.Sh EXIT STATUS
|
|
.Ex -std
|
|
.Sh SEE ALSO
|
|
.Xr termios 4 ,
|
|
.Xr tty 4
|
|
.Sh STANDARDS
|
|
The
|
|
.Nm
|
|
utility is expected to be
|
|
.St -p1003.2
|
|
compatible.
|
|
The
|
|
.Fl e
|
|
and
|
|
.Fl f
|
|
flags are
|
|
extensions to the standard, as are the operands mentioned in the control
|
|
operations section.
|
|
.Sh HISTORY
|
|
An
|
|
.Nm
|
|
utility appeared in
|
|
.At v2 .
|