1.\" $NetBSD: tty.1,v 1.7 2002/02/08 01:36:36 ross 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. All advertising materials mentioning features or use of this software 18.\" must display the following acknowledgement: 19.\" This product includes software developed by the University of 20.\" California, Berkeley and its contributors. 21.\" 4. Neither the name of the University nor the names of its contributors 22.\" may be used to endorse or promote products derived from this software 23.\" without specific prior written permission. 24.\" 25.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35.\" SUCH DAMAGE. 36.\" 37.\" @(#)tty.1 8.1 (Berkeley) 6/6/93 38.\" 39.Dd June 6, 1993 40.Dt TTY 1 41.Os 42.Sh NAME 43.Nm tty 44.Nd return user's terminal name 45.Sh SYNOPSIS 46.Nm 47.Op Fl s 48.Sh DESCRIPTION 49The 50.Nm 51utility writes the name of the terminal attached to standard input 52to standard output. 53The name that is written is the string returned by 54.Xr ttyname 3 . 55If the standard input is not a terminal, the message ``not a tty'' 56is written. 57The options are as follows: 58.Bl -tag -width Ds 59.It Fl s 60Don't write the terminal name; only the exit status is affected 61when this option is specified. 62The 63.Fl s 64option is deprecated in favor of the 65.Dq Li "test -t 0" 66command. 67.El 68.Pp 69.Nm 70exits 0 if the standard input is a terminal, 1 if the standard input is 71not a terminal, and \*[Gt]1 if an error occurs. 72.Sh SEE ALSO 73.Xr test 1 , 74.Xr ttyname 3 75.Sh STANDARDS 76The 77.Nm 78utility conforms to 79.St -p1003.2-92 . 80