osf1 man page for wall

wall(1) 						      General Commands Manual							   wall(1)

NAME
       wall - Sends a message to all users logged into the local system or to all members of a cluster

SYNTAX
       wall [-c file]

OPTIONS
       Send message to all users logged into all members of a cluster.

DESCRIPTION
       The  wall  command  reads from standard input until you press the End-of-File key sequence, or takes its input from the contents of file if
       you specify it, and sends the input as a message to all users who are logged in.  The message is preceded by the heading:

       Broadcast Message from user@node (tty) at hh:mm

       where user is the user invoking wall, node and tty are the node and terminal of that user, and hh:mm is the time of the message.

       To override any protections other users have set up, you must be operating with superuser authority.  Typically, the root user uses wall to
       warn all users of an impending system shutdown.

FILES
       To suspend error messages.  Clusterwide message-sending utility called by the wall command.

SEE ALSO
       Commands:  mesg(1), su(1), talk(1), write(1)

																	   wall(1)