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)
Check Out this Related Man Page
WALL(1) User Commands WALL(1)NAME
wall - write a message to all users
SYNOPSIS
wall [-n] [-t timeout] [-g group] [message | file]
DESCRIPTION
wall displays a message, or the contents of a file, or otherwise its standard input, on the terminals of all currently logged in users.
The command will wrap lines that are longer than 79 characters. Short lines are whitespace padded to have 79 characters. The command will
always put a carriage return and new line at the end of each line.
Only the superuser can write on the terminals of users who have chosen to deny messages or are using a program which automatically denies
messages.
Reading from a file is refused when the invoker is not superuser and the program is set-user-ID or set-group-ID.
OPTIONS -n, --nobanner
Suppress the banner.
-t, --timeout timeout
Abandon the write attempt to the terminals after timeout seconds. This timeout must be a positive integer. The default value is
300 seconds, which is a legacy from the time when people ran terminals over modem lines.
-g, --group group
Limit printing message to members of group defined as a group argument. The argument can be group name or GID.
-V, --version
Display version information and exit.
-h, --help
Display help text and exit.
NOTES
Some sessions, such as wdm, that have in the beginning of utmp(5) ut_type data a ':' character will not get the message from wall. This is
done to avoid write errors.
SEE ALSO mesg(1), talk(1), write(1), shutdown(8)HISTORY
A wall command appeared in Version 7 AT&T UNIX.
AVAILABILITY
The wall command is part of the util-linux package and is available from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils/util-
linux/>.
util-linux August 2013 WALL(1)
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