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LEARN ABOUT PLAN9

mesg

MESG(1) 							   User Commands							   MESG(1)

NAME

       mesg - display (or do not display) messages from other users

SYNOPSIS

       mesg [option] [n|y]

DESCRIPTION

       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.

       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.

ARGUMENTS

       n      Disallow messages.

       y      Allow messages to be displayed.

       If no arguments are given, mesg shows the current message status on standard error output.

OPTIONS

       -v, --verbose
	      Explain what is being done.

       -V, --version
	      Display version information and exit.

       -h, --help
	      Display help text and exit.

EXIT STATUS

       The mesg utility exits with one of the following values:

	    0	  Messages are allowed.

	    1	  Messages are not allowed.

	   >1	  An error has occurred.

FILES

       /dev/[pt]ty[pq]?

SEE ALSO

       login(1), talk(1), write(1), wall(1), xterm(1)

HISTORY

       A mesg command appeared in Version 6 AT&T UNIX.

AVAILABILITY

       The mesg command is part of the util-linux package and is available from https://www.kernel.org/pub/linux/utils/util-linux/.

util-linux							     July 2014								   MESG(1)

Linux