2.9BSD/usr/man/cat8/wall.8

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WALL(8)             UNIX Programmer's Manual              WALL(8)

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??          users terminals
     /etc/utmp           file of active users' names and termi-
     nals

SEE ALSO
     mesg(1), write(1)

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

Printed 5/17/83                                                 1