tty man page on OpenBSD

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TTY(1)			   OpenBSD Reference Manual			TTY(1)

NAME
     tty - return user's terminal name

SYNOPSIS
     tty [-s]

DESCRIPTION
     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.

EXIT STATUS
     The tty utility exits 0 if the standard input is a terminal, 1 if the
     standard input is not a terminal, or >1 if an error occurred.

SEE ALSO
     stty(1), test(1), ttyname(3), tty(4)

STANDARDS
     The tty utility is compliant with the IEEE Std 1003.1-2008 (``POSIX'')
     specification.

     The flag [-s] is an extension to that specification.

HISTORY
     A tty command appeared in Version 1 AT&T UNIX.

OpenBSD 4.9		       September 3, 2010		   OpenBSD 4.9
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