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. All advertising materials mentioning features or use of this software 16.\" must display the following acknowledgement: 17.\" This product includes software developed by the University of 18.\" California, Berkeley and its contributors. 19.\" 4. Neither the name of the University nor the names of its contributors 20.\" may be used to endorse or promote products derived from this software 21.\" without specific prior written permission. 22.\" 23.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33.\" SUCH DAMAGE. 34.\" 35.\" @(#)tty.1 8.1 (Berkeley) 6/6/93 36.\" 37.Dd June 6, 1993 38.Dt TTY 1 39.Os 40.Sh NAME 41.Nm tty 42.Nd return user's terminal name 43.Sh SYNOPSIS 44.Nm tty 45.Op Fl s 46.Sh DESCRIPTION 47The 48.Nm tty 49utility writes the name of the terminal attached to standard input 50to standard output. 51The name that is written is the string returned by 52.Xr ttyname 3 . 53If the standard input is not a terminal, the message ``not a tty'' 54is written. 55The options are as follows: 56.Bl -tag -width Ds 57.It Fl s 58Don't write the terminal name; only the exit status is affected 59when this option is specified. 60The 61.Fl s 62option is deprecated in favor of the 63.Dq Li "test -t 0" 64command. 65.El 66.Pp 67.Nm Tty 68exits 0 if the standard input is a terminal, 1 if the standard input is 69not a terminal, and >1 if an error occurs. 70.Sh SEE ALSO 71.Xr test 1 , 72.Xr ttyname 3 73.Sh STANDARDS 74The 75.Nm tty 76function is expected to be 77.St -p1003.2 78compatible. 79