wall(1M)wall(1M)NAMEwall - write message to all users
Without arguments, the command reads a message from standard input
until end-of-file. Then it sends this message to all currently logged-
in users preceded by:
If the option is specified, sends the message to all currently logged-
in groupname members (as specified in preceded by:
If file is specified, reads file instead of standard input.
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)).
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)).
International Code Set Support
Single- and multibyte character code sets are supported.
The open on a user's tty file failed.
The command will be WITHDRAWN from X/Open standard and may not be por‐
table to other vendor's platforms.
was developed by AT&T and HP.
FILESSEE ALSOmesg(1), write(1).