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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.

     tty [OPTION]...

   The program accepts the following option.  Also see *note Common

     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