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+.\" Copyright (c) 1990, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" This code is derived from software contributed to Berkeley by
+.\" the Institute of Electrical and Electronics Engineers, Inc.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)tty.1	8.1 (Berkeley) 6/6/93
+.\" %FreeBSD: src/usr.bin/tty/tty.1,v 1.7 2002/04/20 12:17:36 charnier Exp %
+.\" $FreeBSD$
+.\"
+.Dd June 6, 1993
+.Dt TTY 1
+.Os
+.Sh 名称
+.Nm tty
+.Nd 端末名を返す
+.Sh 書式
+.Nm
+.Op Fl s
+.Sh 解説
+.Nm
+ユーティリティは、標準入力になっている端末の名前を標準出力へ出力します。
+この名前は、
+.Xr ttyname 3
+で得られる文字列です。標準入力が端末でない場合は、
+``not a tty'' と出力します。
+オプションとしては以下のものがあります。
+.Bl -tag -width Ds
+.It Fl s
+端末名を表示しません。結果は終了コードだけに反映されます。ただし、この
+オプションを使うよりは
+.Dq Li "test -t 0"
+コマンドを使ったほうがよりよいでしょう。
+.El
+.Pp
+.Nm
+ユーティリティは、標準入力が端末だった場合は 0 を、端末でなかった場合
+は 1 を、エラーが起きた場合は 2 以上の値を返します。
+.Sh 関連項目
+.Xr test 1 ,
+.Xr ttyname 3
+.Sh 規格
+.Nm
+ユーティリティは
+.St -p1003.2
+準拠であると考えられています。
+.Sh 歴史
+.Nm
+コマンドは
+.At v1
+から登場しました。