wall(1m)
_________________________________________________________________
wall
write to all users
_________________________________________________________________
SYNTAX
/etc/wall
DESCRIPTION
Wall reads its standard input until an end-of-file. It then
sends a message to all currently logged-in users preceded by:
Broadcast Message from ...
Wall is typically used to warn all users prior to shutting down
the system.
The sender must be superuser 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.
DG/UX 4.00 Page 1
Licensed material--property of copyright holder(s)