V3/usr/man/man1/mesg.1

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NAME		mesg  --  permit or deny messages
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SYNOPSIS	mesg____ [ n_ ][ y_ ]
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DESCRIPTION	mesg____ n_
forbids messages via write_____ by revoking non-user
write permission on the user's typewriter.
mesg____ y_ reinstates permission.
mesg____ with no argument reverses the current permission.
In all cases the previous state is reported.
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FILES		/dev/tty?
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SEE ALSO	write(I)
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DIAGNOSTICS	"?" if the standard input file is not a typewriter
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BUGS		--