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.Dd June 6, 1993 32.Dt TTY 1 33.Os 34.Sh NAME 35.Nm tty 36.Nd return user's terminal name 37.Sh SYNOPSIS 38.Nm 39.Op Fl s 40.Sh DESCRIPTION 41The 42.Nm 43utility writes the name of the terminal attached to standard input 44to standard output. 45The name that is written is the string returned by 46.Xr ttyname 3 . 47If the standard input is not a terminal, the message 48.Dq Li "not a tty" 49is written. 50The options are as follows: 51.Bl -tag -width indent 52.It Fl s 53Do not write the terminal name; only the exit status is affected 54when this option is specified. 55The 56.Fl s 57option is deprecated in favor of the 58.Dq Li "test -t 0" 59command. 60.El 61.Sh EXIT STATUS 62The 63.Nm 64utility 65exits 0 if the standard input is a terminal, 1 if the standard input is 66not a terminal, and >1 if an error occurs. 67.Sh SEE ALSO 68.Xr test 1 , 69.Xr ttyname 3 70.Sh STANDARDS 71The 72.Nm 73utility is expected to be 74.St -p1003.2 75compatible. 76.Sh HISTORY 77A 78.Nm 79command appeared in 80.At v1 . 81