WALL(1M)                             SysV                             WALL(1M)



NAME
     wall - write to all users on a node

SYNOPSIS
     /etc/wall

DESCRIPTION
     wall reads its standard input until an end-of-file (EOF), then sends the
     specified message to all users currently logged in on a particular node.
     The message is always preceded by

     Broadcast Message from ...


     wall is helpful for notifying users of important information, and
     particularly for warning them prior to a system shutdown.

NOTE
     The sender must be super-user.

FILES
     /dev/pty*      Device filenames

     /dev/sio*      Device filenames

DIAGNOSTICS
      "Cannot send to ..."
                    when the open on a user's tty file fails.

SEE ALSO
     write(1)