Research V4 development

Work on file man/man1/mesg.1

Co-Authored-By: Ken Thompson <ken@research.uucp>
Synthesized-from: v4

diff --git a/man/man1/mesg.1 b/man/man1/mesg.1
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+.th MESG I 3/15/72
+.sh NAME
+mesg  \*-  permit or deny messages
+.sh SYNOPSIS
+.bd mesg
+[
+.bd n
+] [
+.bd y
+]
+.sh DESCRIPTION
+.it Mesg
+with argument
+.bd n
+forbids messages via
+.it write
+by revoking non-user
+write permission on the user's typewriter.
+.it Mesg
+with argument
+.bd y
+reinstates permission.
+All by itself,
+.it mesg
+reverses the current permission.
+In all cases the previous state is reported.
+.sh FILES
+/dev/tty?
+.sh "SEE ALSO"
+write(I)
+.sh DIAGNOSTICS
+`?' if the standard input file is not a typewriter
+.sh BUGS