tty - get the name of the terminal
tty [ -l ] [ -s ]
tty prints the path name of the user's terminal.
-l prints the synchronous line number to which the user's terminal is
connected, if it is on an active synchronous line.
-s inhibits printing of the terminal path name, allowing one to test
just the exit code.
2 if invalid options were specified,
0 if standard input is a terminal,
``not on an active synchronous line'' if the standard input is not a
synchronous terminal and -l is specified.
``not a tty'' if the standard input is not a terminal and -s is not
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