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.
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@example.com. This page was obtained from the
project's upstream Git repository
2015-10-19. If you discover any rendering problems in this HTML ver‐
sion 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 man‐
ual page), send a mail to firstname.lastname@example.org
util-linux August 2013 WALL(1)