wall(ADM)                       19 June 1992                       wall(ADM)


 Name

    wall - write to all users

 Syntax

    /etc/wall

 Description

    The wall command reads a message from the standard input until an end-
    of-file.  It then sends this message to all users currently logged in
    preceded by Broadcast Message from ....  wall is used to warn all users,
    for example, prior to shutting down the system.

    The sender should be super user to override any protections the users may
    have invoked.

 File

    /dev/tty*

 See also

    mesg(C), write(C)

 Diagnostics

    Cannot send to ...  The open on a user's tty file has failed.