1.\" Copyright (c) 1990, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" the Institute of Electrical and Electronics Engineers, Inc. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 3. Neither the name of the University nor the names of its contributors 16.\" may be used to endorse or promote products derived from this software 17.\" without specific prior written permission. 18.\" 19.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29.\" SUCH DAMAGE. 30.\" 31.\" @(#)tty.1 8.1 (Berkeley) 6/6/93 32.\" 33.Dd June 6, 1993 34.Dt TTY 1 35.Os 36.Sh NAME 37.Nm tty 38.Nd return user's terminal name 39.Sh SYNOPSIS 40.Nm 41.Op Fl s 42.Sh DESCRIPTION 43The 44.Nm 45utility writes the name of the terminal attached to standard input 46to standard output. 47The name that is written is the string returned by 48.Xr ttyname 3 . 49If the standard input is not a terminal, the message 50.Dq Li "not a tty" 51is written. 52The options are as follows: 53.Bl -tag -width indent 54.It Fl s 55Do not write the terminal name; only the exit status is affected 56when this option is specified. 57The 58.Fl s 59option is deprecated in favor of the 60.Dq Li "test -t 0" 61command. 62.El 63.Sh EXIT STATUS 64The 65.Nm 66utility 67exits 0 if the standard input is a terminal, 1 if the standard input is 68not a terminal, and >1 if an error occurs. 69.Sh SEE ALSO 70.Xr test 1 , 71.Xr ttyname 3 72.Sh STANDARDS 73The 74.Nm 75utility is expected to be 76.St -p1003.2 77compatible. 78.Sh HISTORY 79A 80.Nm 81command appeared in 82.At v1 . 83