NAME
	  tty -	Returns	pathname of terminal device

     SYNOPSIS
	  tty [-s]


	  The tty command writes the full pathname of your terminal
	  device to standard output.

     FLAGS
	  -s  Suppresses reporting the pathname	(Obsolescent).


     DESCRIPTION
	  The tty -s command evaluates as TRUE if standard output is a
	  display and FALSE if it is not.

	  The /dev/tty special file always refers to your controlling
	  terminal, although it	also may have another name like
	  /dev/console or /dev/tty2.  To avoid writing undesirable
	  output to an output file (for	example, to write a prompt in
	  a shell script to the	screen,	while writing the response to
	  the prompt to	an output file)	redirect standard output to
	  /dev/tty.

     EXAMPLES
	   1.  To display the full pathname of your terminal device,
	       enter:

	       tty



	   2.  To test whether or not the standard input is a terminal
	       device, enter:

	       if test -t 0
	       then
		    echo "Output is a display"
	       else
		    echo "Output is not	a display"


     FILES
	  /dev/tty
		 Pseudodevice representing the user's controlling ter-
		 minal.


     DIAGNOSTICS
	  not a	tty Your standard input	is not an interactive terminal
		    and	you did	not specify the	-s flag.


     EXIT VALUES
	  The exit value has the following possible meanings:


	  0   Standard input is	a tty.

	  1   Standard input is	not a tty.

	  2   Invalid flags specified or other error.


     RELATED INFORMATION
	  Commands:  stty(1).

	  Subroutines:	isatty(3), ttyname(3).

	  Files:  tty(7).