WALL(1)

NAME
       wall -- send a message to everybody's terminal.

SYNOPSIS
       wall [ message ]

DESCRIPTION
       Wall  sends  a  message  to everybody logged in with their
       mesg(1) permission set to yes. The message can be given as
       an  argument to wall, or it can be sent to wall's standard
       input. When using the standard input from a terminal,  the
       message  should  be  terminated  with the EOF key (usually
       Control-D).

SEE ALSO
       mesg(1). 

AUTHOR
       Miquel van Smoorenburg, miquels@cistron.nl