wall(1M)                                                 wall(1M)



     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)).

     EXAMPLE
               wall

          will broadcast the standard input to all users who are not
          protected against receiving messages by the mesg command.

     FILES
          /etc/wall
          /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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