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|Original author(s)||Dennis Ritchie,|
|Developer(s)||AT&T Bell Laboratories|
|Initial release||November 3, 1971|
|Operating system||Unix and Unix-like|
It is invoked as:
The 'y' and 'n' options respectively allow and disallow write access to the current user's terminal. When invoked with no option, the current permission is printed.
% mesg is y % tty /dev/tty1 % mesg < /dev/tty2 is y % mesg n < /dev/tty2 % mesg < /dev/tty2 is n % mesg is y