From owner-freebsd-questions@FreeBSD.ORG  Sat Aug  2 23:36:32 2008
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 19A60106567B
	for <freebsd-questions@freebsd.org>;
	Sat,  2 Aug 2008 23:36:32 +0000 (UTC)
	(envelope-from perryh@pluto.rain.com)
Received: from agora.rdrop.com (oldagora.rdrop.com [199.26.172.34])
	by mx1.freebsd.org (Postfix) with ESMTP id CDA618FC08
	for <freebsd-questions@freebsd.org>;
	Sat,  2 Aug 2008 23:36:31 +0000 (UTC)
	(envelope-from perryh@pluto.rain.com)
Received: from agora.rdrop.com (66@localhost [127.0.0.1])
	by agora.rdrop.com (8.13.1/8.12.7) with ESMTP id m72NaUCp048065
	(version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT)
	for <freebsd-questions@freebsd.org>;
	Sat, 2 Aug 2008 16:36:31 -0700 (PDT)
	(envelope-from perryh@pluto.rain.com)
Received: (from uucp@localhost)
	by agora.rdrop.com (8.13.1/8.12.9/Submit) with UUCP id m72NaU0Q048064
	for freebsd-questions@freebsd.org; Sat, 2 Aug 2008 16:36:30 -0700 (PDT)
Received: from fbsd61 by pluto.rain.com (4.1/SMI-4.1-pluto-M2060407)
	id AA27711; Sat, 2 Aug 08 16:34:39 PDT
Date: Sat, 02 Aug 2008 16:35:10 -0700
From: perryh@pluto.rain.com
To: freebsd-questions@freebsd.org
Message-Id: <4894ef2e.2NiKL22MfAcdbs27%perryh@pluto.rain.com>
User-Agent: nail 11.25 7/29/05
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Subject: undocumented tar --unlink switch
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sat, 02 Aug 2008 23:36:32 -0000

Around line 37 of /usr/src/usr.sbin/pkg_install/add/extract.c
there's an invocation of /usr/bin/tar with a --unlink switch,
which I don't see mentioned in the tar(1) manpage.  Anyone
happen to know what this does, or do I need to dig into the
code?