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BSD 2.11 - man page for mesg (bsd section 1)

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 and talk(1) by revoking non-user write permission on the user's terminal. Mesg with argu- ment y reinstates permission. All by itself, mesg reports the current state without changing it.
FILES
/dev/tty*
SEE ALSO
write(1), talk(1)
DIAGNOSTICS
Exit status is 0 if messages are receivable, 1 if not, 2 on error. 7th Edition April 29, 1985 MESG(1)
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