tty - return user's terminal name
The tty utility writes the name of the terminal attached to
to standard output. The name that is written is the
If the standard input is not a terminal, the message ``not a
The options are as follows:
-s Don't write the terminal name; only the exit status
when this option is specified. The -s option is
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.
stty(1), test(1), ttyname(3), tty(4)
The tty utility conforms to IEEE Std 1003.2-1992
A tty command appeared in Version 1 AT&T UNIX.
OpenBSD 3.6 June 6, 1993
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