tty man page on 4.4BSD

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TTY(1)			  BSD General Commands Manual			TTY(1)

     tty — return user's terminal name

     tty [-s]

     The tty utility writes the name of the terminal attached to standard
     input to standard output.	The name that is written is the string
     returned by ttyname(3).  If the standard input is not a terminal, the
     message ``not a tty'' is written.	The options are as follows:

     -s	     Don't write the terminal name; only the exit status is affected
	     when this option is specified.  The -s option is deprecated in
	     favor of the “test -t 0” command.

     Tty exits 0 if the standard input is a terminal, 1 if the standard input
     is not a terminal, and >1 if an error occurs.

     test(1), ttyname(3)

     The tty function is expected to be IEEE Std 1003.2 (“POSIX.2”) compati‐

BSD				 June 6, 1993				   BSD

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