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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | NOTES | HISTORY | SEE ALSO | REPORTING BUGS | AVAILABILITY |
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WALL(1) User Commands WALL(1)
wall - write a message to all users
wall [-n] [-t timeout] [-g group] [message | file]
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.
-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.
-h, --help
Display help text and exit.
-V, --version
Display version and exit.
Some sessions, such as wdm(1x), 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.
A wall command appeared in Version 7 AT&T UNIX.
mesg(1), talk(1), write(1), shutdown(8)
For bug reports, use the issue tracker
<https://github.com/util-linux/util-linux/issues>.
The wall 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/>. This page is
part of the util-linux (a random collection of Linux utilities)
project. Information about the project can be found at
⟨https://www.kernel.org/pub/linux/utils/util-linux/⟩. If you have a
bug report for this manual page, send it to
util-linux@vger.kernel.org. This page was obtained from the
project's upstream Git repository
⟨git://git.kernel.org/pub/scm/utils/util-linux/util-linux.git⟩ on
2025-08-11. (At that time, the date of the most recent commit that
was found in the repository was 2025-08-05.) If you discover any
rendering problems in this HTML version of the page, or you
believe there is a better or more up-to-date source for the page,
or you have corrections or improvements to the information in this
COLOPHON (which is not part of the original manual page), send a
mail to man-pages@man7.org
util-linux 2.42-start-521-ec46 2025-08-09 WALL(1)
Pages that refer to this page: mesg(1), systemctl(1), systemd-ask-password(1), systemd-tty-ask-password-agent(1), logind.conf(5), poweroff(8), shutdown(8), systemd-ask-password-console.service(8), systemd-journald.service(8)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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