HP-UX Reference (11i v2 03/08) - 1M System Administration Commands N-Z (vol 4)

w
wall(1M) wall(1M)
NAME
wall - write message to all users
SYNOPSIS
/usr/sbin/wall
[-ggroupname][file]
/usr/sbin/cwall
[-ggroupname][file]
DESCRIPTION
Without arguments, the
wall command reads a message from standard input until end-of-file. Then it
sends this message to all currently logged-in users preceded by:
Broadcast Message from ...
If the
-ggroupname option is specified,
wall sends the message to all currently logged-in groupname
members (as specified in
/etc/group) preceded by:
Broadcast Message from ... to group groupname
If file is specified,
wall reads file instead of standard input.
wall is typically used to warn all users prior to shutting down the system.
The sender must have appropriate privileges to override any protections the users may have invoked (see
mesg(1)).
wall has timing delays, and takes at least 30 seconds to complete.
You must have appropriate privileges to override any protections users may have invoked (see mesg(1)).
EXTERNAL INFLUENCES
International Code Set Support
Single- and multibyte character code sets are supported.
DIAGNOSTICS
Cannot send to ...
The open on a user’s tty file failed.
WARNINGS
The
wall command will be WITHDRAWN from X/Open standard and may not be portable to other
vendor’s platforms.
AUTHOR
wall was developed by AT&T and HP.
FILES
/dev/tty*
SEE ALSO
mesg(1), write(1).
STANDARDS CONFORMANCE
wall: SVID2, SVID3, XPG2, XPG3
Section 1M−−916 Hewlett-Packard Company − 1 − HP-UX 11i Version 2: August 2003