wall - write to all users
/sbin/wall [-g group] [msg_file]
wall reads msg_file (or its standard input if none specified) until an
end-of-file. It then sends this message to all currently logged-in users
Broadcast Message from ...
If the -g option is used then only those users in the specified group as
defined in the file /etc/group or the NIS group map are sent the message.
The list of logged-on users is derived from the file /var/adm/utmp.
It is used to warn all users, typically prior to shutting down the
The sender must be super-user to override any protections the users may
have invoked (see mesg(1)).
wall does not send messages to ftp users.
mesg(1), write(1), who(1).
``Cannot send to ...'' when the open on a user's tty file fails.
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