.\" Copyright (c) 1980 Regents of the University of California.
.\" All rights reserved. The Berkeley software License Agreement
.\" specifies the terms and conditions for redistribution.
.\" @(#)wall.1 6.1 (Berkeley) %G%
wall \- write to all users
reads its standard input until an end-of-file.
It then sends this message,
The sender should be super-user to override
any protections the users may have invoked.
`Cannot send to ...' when the open on