mesg(1) - Unix First Edition Manual Page
11/3/71MESG (I)

NAME mesg -- permit or deny messages
SYNOPSIS mesg [n][y]
DESCRIPTION mesg n forbids messages via write by revoking non--userwrite permission on the user's typewriter. mesg y

reinstates permission. mesg with no argument reverses thecurrent permission. In all cases the previous state is reported.
FILES /dev/ttyn
SEE_ALSO write
DIAGNOSTICS "?" if the standard input file is not a typewriter
OWNER dmr, ken