WALL(8)                                                   WALL(8)

     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, 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.