NAME
wall — write message to all users
SYNOPSIS
/usr/sbin/wall
[-g
groupname]
[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command will be WITHDRAWN from X/Open standard and may not be portable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.
STANDARDS CONFORMANCE
wall: SVID2, SVID3, XPG2, XPG3
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