*BASH User Commands Ubuntu 10.04.4 LTS Server coreutils
GNU/Linux
WALL(1)                   BSD General Commands Manual                  WALL(1)

NAME
     wall -- write a message to users

SYNOPSIS
     wall [file]

DESCRIPTION
     Wall displays the contents of file or, by default, its standard input, on
     the terminals of all currently logged in users.

     Only the super-user can write on the terminals of users who have chosen
     to deny messages or are using a program which automatically denies mes-
     sages.

     Reading from a file is refused when the invoker is not superuser and the
     program is suid or sgid.

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-ng package and is available
     from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.

Linux 0.99                       March 8, 1993                      Linux 0.99