A/UX® System Administrator's Reference Sections 1M, 7, and 8

wall(lM) wall(lM)
NAME
wall - write to all users
SYNOPSIS
Jete/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 superuser to override any protections the users
may have invoked (see mesg(1».
EXAMPLES
wall
will broadcast the standard input to all users who are not protected
against receiving messages by the mesg command.
FILES
Jete/wall
/dev/tty*
SEE ALSO
mesg(l), wri te(l).
DIAGNOSTICS
"Cannot send to ... " when the open on a user's tty file
fails.
1 February, 1990
RevisionC