NAME
     mesg  -  permit or deny messages

SYNOPSIS
     mesg [ n ] [ y ]

DESCRIPTION
     Mesg with argument n forbids messages via write by revoking
     non-user write permission on the user's typewriter.  Mesg
     with argument y reinstates permission.  All by itself, mesg
     reverses the current permission.  In all cases the previous
     state is reported.

FILES
     /dev/tty?

SEE ALSO
     write (I)

DIAGNOSTICS
     `?' if the standard input file is not a typewriter

BUGS

 1