tty: Print file name of terminal on standard input

tty prints the file name of the terminal connected to its standard input. It prints `not a tty' if standard input is not a terminal. Synopsis:

tty [option]...

The program accepts the following option. Also see section Common options.

`-s'

`--silent'

`--quiet'

Print nothing; only return an exit status.

Exit status:

0 if standard input is a terminal
1 if standard input is not a terminal
2 if given incorrect arguments
3 if a write error occurs

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