1.\" $NetBSD: tty.1,v 1.8 2003/08/07 11:16:51 agc Exp $ 2.\" 3.\" Copyright (c) 1990, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" This code is derived from software contributed to Berkeley by 7.\" the Institute of Electrical and Electronics Engineers, Inc. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 3. Neither the name of the University nor the names of its contributors 18.\" may be used to endorse or promote products derived from this software 19.\" without specific prior written permission. 20.\" 21.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31.\" SUCH DAMAGE. 32.\" 33.\" @(#)tty.1 8.1 (Berkeley) 6/6/93 34.\" 35.Dd June 6, 1993 36.Dt TTY 1 37.Os 38.Sh NAME 39.Nm tty 40.Nd return user's terminal name 41.Sh SYNOPSIS 42.Nm 43.Op Fl s 44.Sh DESCRIPTION 45The 46.Nm 47utility writes the name of the terminal attached to standard input 48to standard output. 49The name that is written is the string returned by 50.Xr ttyname 3 . 51If the standard input is not a terminal, the message ``not a tty'' 52is written. 53The options are as follows: 54.Bl -tag -width Ds 55.It Fl s 56Don't write the terminal name; only the exit status is affected 57when this option is specified. 58The 59.Fl s 60option is deprecated in favor of the 61.Dq Li "test -t 0" 62command. 63.El 64.Pp 65.Nm 66exits 0 if the standard input is a terminal, 1 if the standard input is 67not a terminal, and \*[Gt]1 if an error occurs. 68.Sh SEE ALSO 69.Xr test 1 , 70.Xr ttyname 3 71.Sh STANDARDS 72The 73.Nm 74utility conforms to 75.St -p1003.2-92 . 76