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+.\" Copyright (c) 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" 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.
+.\"
+.\"	@(#)groups.1	8.1 (Berkeley) 6/6/93
+.\" jpman %Id: groups.1,v 1.2 1997/05/06 00:59:29 mutoh Stab %
+.\"
+.Dd June 6, 1993
+.Dt GROUPS 1
+.UC
+.Sh 名称
+.Nm groups
+.Nd 所属しているグループをすべて表示する
+.Sh 書式
+.Nm groups
+.Op Ar user
+.Sh 解説
+.Nm groups
+は、
+.Xr id 1
+が登場したために古くなりました。
+これは、
+.Dq Nm id Fl Gn Op Ar user
+と等価です。
+.Dq Nm id Fl p
+が普通の対話的な使い方です。
+.Pp
+.Nm groups
+は、ユーザが属しているグループ ( ユーザを指定した場合はその
+ユーザの属しているグループ ) を表示します。
+.Pp
+.\".Sh 戻り値
+.\"(訳注)原文表記中に上記の章分けがないため削除した。
+.\" 2.2.1R 対象(1997/05/04) Takeshi MUTOH <mutoh@info.nara-k.ac.jp>
+.Nm groups
+は、成功した場合は0を、エラーが起きた場合は0より大きな値を返します。
+.Sh 関連項目
+.Xr id 1