    WALL(VIII)                   4/10/75                   WALL(VIII)

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

         The sender should be super-user to override any  protections
         the users may have invoked.

    FILES
         /dev/tty?

    SEE ALSO
         mesg(I), write(I)

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

    BUGS

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