WALL(1) User Commands WALL(1)
wall – write a message to all users
wall [-n] [-t timeout] [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
Only the superuser can write on the terminals of users who have
chosen to deny messages or are using a program which automatically
Reading from a file is refused when the invoker is not superuser and
the program is suid or sgid.
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.
Display version information and exit.
Display help text and exit.
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.
mesg(1), talk(1), write(1), shutdown(8)
A wall command appeared in Version 7 AT&T UNIX.
The wall command is part of the util-linux package and is available
from Linux Kernel Archive
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
[email protected] This page was obtained from the
project’s upstream Git repository
2014-12-30. If you discover any rendering problems in this HTML ver‐
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information in this COLOPHON (which is not part of the original man‐
ual page), send a mail to [email protected]
util-linux August 2013 WALL(1)