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WALL(1) NetBSD General Commands Manual WALL(1)
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by Kimmo Suominen.
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wall -- write a message to users
wall [-g group] [file]
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-
-g Send messages to users in this group. This option may be speci-
fied multiple times, and any user in any of the specified groups
will receive the message.
mesg(1), talk(1), write(1), shutdown(8)
A wall command appeared in Version 7 AT&T UNIX. Support for -g was added
in NetBSD 2.0 (from OpenBSD 2.0).
NetBSD 9.1 March 27, 2003 NetBSD 9.1