127 lines
4.4 KiB
Text
127 lines
4.4 KiB
Text
//po4a: entry man manual
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////
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Copyright (c) 1987, 1990, 1993
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The Regents of the University of California. All rights reserved.
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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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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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@(#)mesg.1 8.1 (Berkeley) 6/6/93
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////
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= mesg(1)
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:doctype: manpage
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:man manual: User Commands
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:man source: util-linux {release-version}
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:page-layout: base
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:command: mesg
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== NAME
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mesg - display (or do not display) messages from other users
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== SYNOPSIS
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*mesg* [_option_] [*n*|*y*]
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== DESCRIPTION
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The *mesg* utility is invoked by a user to control write access others have to the terminal device associated with standard error output. If write access is allowed, then programs such as *talk*(1) and *write*(1) may display messages on the terminal.
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Traditionally, write access is allowed by default. However, as users become
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more conscious of various security risks, there is a trend to remove write
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access by default, at least for the primary login shell.
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The initial permissions for the terminal are set by *login*(1) according to TTYPERM
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and TTYGROUP from /etc/login.defs. The default is mode _0620_ if a tty group is used,
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and _0600_ without the group. The default tty group name is "tty".
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To ensure that your ttys are set in a portable and independent manner from system
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settings, *mesg* should be executed in your login scripts.
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*mesg* modifies the write permissions for a group on the current terminal
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device. Since version 2.41, *mesg* can no longer be compiled to make the
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terminal writable for _others_ and strictly modifies only _group_ permissions.
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The usual setup is to use a "tty" group and add relevant users to this group.
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Alternatively, a less secure solution is to set utilities like *write*(1) or
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*wall*(1) to setgid for the "tty" group.
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The *mesg* utility silently exits with error status 2 if not executed on a terminal. In this case executing *mesg* is pointless. The command line option *--verbose* forces *mesg* to print a warning in this situation. This behaviour has been introduced in version 2.33.
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== ARGUMENTS
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*n*::
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Disallow messages.
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*y*::
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Allow messages to be displayed.
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If no arguments are given, *mesg* shows the current message status on standard error output.
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== OPTIONS
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*-v*, *--verbose*::
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Explain what is being done.
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include::man-common/help-version.adoc[]
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== EXIT STATUS
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The *mesg* utility exits with one of the following values:
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*0*::
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Messages are allowed.
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*1*::
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Messages are not allowed.
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*>1*::
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An error has occurred.
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== FILES
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_/dev/[pt]ty*_, _/dev/pts/[0-9]*_
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== HISTORY
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*mesg* (I) appears in the UNIX Programmer's Manual.
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It used to invert the current state with no argument before Version 7 AT&T UNIX.
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== SEE ALSO
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*login*(1),
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*talk*(1),
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*write*(1),
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*wall*(1),
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*xterm*(1)
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include::man-common/bugreports.adoc[]
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include::man-common/footer.adoc[]
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ifdef::translation[]
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include::man-common/translation.adoc[]
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endif::[]
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