WALL(1-SysV)        RISC/os Reference Manual         WALL(1-SysV)



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.


























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