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WALL(1) General Commands Manual WALL(1)

wall — write a message to users

wall [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 messages.

mesg(1), talk(1), write(1), shutdown(8)

A wall command appeared in Version 7 AT&T UNIX.

BSD 4 June 6, 1993 WALL(1)