MESG(1)                                                   MESG(1)

     NAME
          mesg - permit or deny messages

     SYNOPSIS
          mesg [ n ] [ y ]

     DESCRIPTION
          Mesg with argument n forbids messages via write(1) by revok-
          ing non-user write permission on the user's terminal.  Mesg
          with argument y reinstates permission.  All by itself, mesg
          reports the current state without changing it.

     FILES
          /dev/tty*

     SEE ALSO
          write(1)

     DIAGNOSTICS
          Exit status is 0 if messages are receivable, 1 if not, 2 on
          error.