Mesg

The `y` and `n` options respectively allow and disallow write access to your terminal. When invoked with no option, the current permission is printed. ...
Found on http://en.wikipedia.org/wiki/Mesg

mesg

Control write access to your terminal, see Section 4.1.6.
Found on http://www.tldp.org/LDP/intro-linux/html/gloss.html
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