Scientific Operations



WALL(VIII)                   4/10/75                   WALL(VIII)



NAME
     wall  -  write to all users

SYNOPSIS
     /etc/wall

DESCRIPTION
     Wall reads its standard input until an end-of-file.  It then
     sends this message to all currently logged in users preceded
     by ``Broadcast Message ...''.  It is used to warn all users,
     typically prior to shutting down the system.

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

FILES
     /dev/tty?

SEE ALSO
     mesg(I), write(I)

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

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