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) permis-
    sion 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).

    The length of the message is limited to 20 lines.

NOTES
    There is an undocumented (well not anymore..) option, "-n", that
    supresses the banner printed by wall . This is for usage by rwalld
    (8).  Wall will not allow you to use that flag if wall is installed
    set-group-id and the user executing wall is not root.

    For every invocation of wall a notification will be written to syslog,
    with facility LOG_USER and level LOG_INFO.

ENVIRONMENT
    Wall ignores the TZ variable - the time printed in the banner is based
    on the systems local time.

SEE ALSO
   mesg(1), rpc.rwalld(8).

AUTHOR
    Miquel van Smoorenburg, miquels@cistron.nl