WALL(1) — Stardent Computer Inc. (Essential Utilities)
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
DIAGNOSTICS
“Cannot send to ...” when the open on a user’s tty file fails.
September 29, 2021