1.\" $OpenBSD: tty.1,v 1.15 2014/06/03 20:29:41 jmc Exp $ 2.\" $NetBSD: tty.1,v 1.4 1994/12/07 00:46:55 jtc Exp $ 3.\" 4.\" Copyright (c) 1990, 1993 5.\" The Regents of the University of California. All rights reserved. 6.\" 7.\" This code is derived from software contributed to Berkeley by 8.\" the Institute of Electrical and Electronics Engineers, Inc. 9.\" 10.\" Redistribution and use in source and binary forms, with or without 11.\" modification, are permitted provided that the following conditions 12.\" are met: 13.\" 1. Redistributions of source code must retain the above copyright 14.\" notice, this list of conditions and the following disclaimer. 15.\" 2. Redistributions in binary form must reproduce the above copyright 16.\" notice, this list of conditions and the following disclaimer in the 17.\" documentation and/or other materials provided with the distribution. 18.\" 3. Neither the name of the University nor the names of its contributors 19.\" may be used to endorse or promote products derived from this software 20.\" without specific prior written permission. 21.\" 22.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32.\" SUCH DAMAGE. 33.\" 34.\" @(#)tty.1 8.1 (Berkeley) 6/6/93 35.\" 36.Dd $Mdocdate: June 3 2014 $ 37.Dt TTY 1 38.Os 39.Sh NAME 40.Nm tty 41.Nd return user's terminal name 42.Sh SYNOPSIS 43.Nm tty 44.Op Fl s 45.Sh DESCRIPTION 46The 47.Nm 48utility writes the name of the terminal attached to standard input 49to standard output. 50The name that is written is the string returned by 51.Xr ttyname 3 . 52.Pp 53If the standard input is not a terminal, the message 54.Dq not a tty 55is written. 56.Pp 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.Sh EXIT STATUS 69The 70.Nm 71utility exits 0 if the standard input is a terminal, 1 if the standard input 72is not a terminal, or >1 if an error occurred. 73.Sh SEE ALSO 74.Xr stty 1 , 75.Xr test 1 , 76.Xr ttyname 3 , 77.Xr tty 4 78.Sh STANDARDS 79The 80.Nm 81utility is compliant with the 82.St -p1003.1-2008 83specification. 84.Sh HISTORY 85A 86.Nm 87command appeared in 88.At v1 . 89