


      WALL(1)                                                   WALL(1)



      NAME
           wall - write to all users

      SYNTAX
           /etc/wall

      DESCRIPTION
           Wall reads its standard input until an end-of-file.  It then
           sends this message to all currently logged in users preceded
           by:

                Broadcast Message from ...

           It is used to warn all users, typically prior to shutting
           down the system.

           The sender must be super-user to override any protections
           the users may have invoked (see mesg(1)).

      FILES
           /dev/tty*

      SEE ALSO
           mesg(1), write(1).

      DIAGNOSTICS
           ``Cannot send to ...'' when the open on a user's tty file
           fails.



























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