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19.4 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 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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