man > mesg(1)

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.

       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.

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.

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

       -V, --version
           Print version 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*, /dev/pts/[0-9]*

HISTORY
       mesg (I) appears in the UNIX Programmer’s Manual. It used to invert the current state with no
       argument before Version 7 AT&T UNIX.

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

REPORTING BUGS
       For bug reports, use the issue tracker at https://github.com/util-linux/util-linux/issues.

AVAILABILITY
       The mesg command is part of the util-linux package which can be downloaded from Linux Kernel
       Archive <https://www.kernel.org/pub/linux/utils/util-linux/>.

util-linux 2.39.3                            2023-11-21                                      MESG(1)