Name
mesg — display (do not display) messages from other
users
DESCRIPTION
The mesg
utility is invoked by a users to control write access others
have to the terminal device associated with the standard
error output. If write access is allowed, then programs such
as talk(1) and write(1) may display
messages on the terminal.
Traditionally, write access is allowed by default.
However, as users become more conscious of various security
risks, there is a trend to remove write access by default, at
least for the primary login shell. To make sure your ttys are
set the way you want them to be set, mesg should be executed in your
login scripts.
Options available:
- n
-
Disallows messages.
- y
-
Permits messages to be displayed.
If no arguments are given, mesg displays the present message
status to the standard error output.
The mesg
utility exits with one of the following values:
- 0
-
Messages are allowed.
- 1
-
Messages are not allowed.
>1
-
An error has occurred.
HISTORY
A mesg
command appeared in Version 6 AT&T UNIX.
Copyright (c) 1987, 1990, 1993
The Regents of the University of California. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. All advertising materials mentioning features or use of this software
must display the following acknowledgement:
This product includes software developed by the University of
California, Berkeley and its contributors.
4. Neither the name of the University nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
@(#)mesg.1
8.1 (Berkeley) 6/6/93
Fri Mar 10 20:31:02 1995, modified for standard man macros,
faith@cs.unc.edu
"
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