4.3BSD - /usr/man/cat1/wall.0

WALL(1)                                                                WALL(1)


NAME
       wall - write to all users

SYNOPSIS
       wall

DESCRIPTION
       Wall reads its standard input until an end-of-file.  It then sends this
       message, preceded by ‘Broadcast Message ...’, to all logged in users.

       The sender should be super-user to override any protections  the  users
       may have invoked.

FILES
       /dev/tty?
       /etc/utmp

SEE ALSO
       mesg(1), write(1)

DIAGNOSTICS
       ‘Cannot send to ...’ when the open on a user’s tty file fails.


4th Berkeley Distribution       April 29, 1985                         WALL(1)