32v 1m wall

WALL(1M) UNIX Programmer's Manual WALL(1M)

NAME

    wall  -  write to all users

SYNOPSIS

    /etc/wall

DESCRIPTION

    _W_a_l_l reads its standard input until an end-of-file.  It then
    sends this message, preceded by `Broadcast Message ...', to
    all logged in users.

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

FILES

    /dev/tty?
    /etc/utmp

SEE ALSO

    mesg(1), write(1)

DIAGNOSTICS

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