v7 man page for mesg

MESG(1) 						      General Commands Manual							   MESG(1)

NAME
       mesg  -	permit or deny messages

SYNOPSIS
       mesg [ n ] [ y ]

DESCRIPTION
       Mesg  with  argument  n	forbids  messages via 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.

FILES
       /dev/tty*
       /dev

SEE ALSO
       write(1)

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

																	   MESG(1)