(coreutils.info.gz) tty invocation

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(coreutils.info.gz) printenv invocation

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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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(coreutils.info.gz) printenv invocation

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