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 in-
     put 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.

     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 4.7                    February 8, 2009                              1
