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mesg(1)
permit or deny messages
From the original Amiga UNIX 2.1 manual. Some things it mentions may not be in this release.
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*
SEE ALSO
write(1).
DIAGNOSTICS
Exit status is 0 if messages are receivable, 1 if not, 2 on error.