(coreutils.info)tty invocation

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19.4 ‘tty’: Print file name of terminal on standard input
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‘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 Note: 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 a non-terminal file
     2 if given incorrect arguments
     3 if a write error occurs