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
1