WALL(1)              INTERACTIVE UNIX System              WALL(1)



          NAME
               wall - write to all users

          SYNOPSIS
               /etc/wall

          DESCRIPTION
               The wall command 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.



























          Rev. Base System                                           Page 1