MESG(1) General Commands Manual MESG(1)
mesg - permit or deny messages on the terminal
mesg [ n ] [ y ]
mesg with argument n forbids messages with write(1) by revoking 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.
Exit status is 0 if messages are receivable, 1 if not, 2 on error.
9 September 1987 MESG(1)