WALL(1)                                                   WALL(1)



     NAME
          wall - write to all users

     SYNOPSIS
          /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.

     ORIGIN
          AT&T V.3
























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