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+<?xml version="1.0" encoding="ISO-8859-1"?>
+<!--
+   Copyright (c) 1991       , Julianne Frances Haugh
+   Copyright (c) 2007 - 2008, Nicolas François
+   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. The name of the copyright holders or contributors may not be used to
+      endorse or promote products derived from this software without
+      specific prior written permission.
+  
+   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT
+   HOLDERS 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.
+-->
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook V4.5//EN"
+  "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
+<!ENTITY SYSLOG_SG_ENAB        SYSTEM "login.defs.d/SYSLOG_SG_ENAB.xml">
+<!-- SHADOW-CONFIG-HERE -->
+]>
+<refentry id='sg.1'>
+  <!-- $Id: sg.1.xml 3742 2012-05-25 11:45:21Z nekral-guest $ -->
+  <refentryinfo>
+    <author>
+      <firstname>Julianne Frances</firstname>
+      <surname>Haugh</surname>
+      <contrib>Creation, 1991</contrib>
+    </author>
+    <author>
+      <firstname>Thomas</firstname>
+      <surname>Kłoczko</surname>
+      <email>kloczek@pld.org.pl</email>
+      <contrib>shadow-utils maintainer, 2000 - 2007</contrib>
+    </author>
+    <author>
+      <firstname>Nicolas</firstname>
+      <surname>François</surname>
+      <email>nicolas.francois@centraliens.net</email>
+      <contrib>shadow-utils maintainer, 2007 - now</contrib>
+    </author>
+  </refentryinfo>
+  <refmeta>
+    <refentrytitle>sg</refentrytitle>
+    <manvolnum>1</manvolnum>
+    <refmiscinfo class="sectdesc">User Commands</refmiscinfo>
+    <refmiscinfo class="source">shadow-utils</refmiscinfo>
+    <refmiscinfo class="version">&SHADOW_UTILS_VERSION;</refmiscinfo>
+  </refmeta>
+  <refnamediv id='name'>
+    <refname>sg</refname>
+    <refpurpose>execute command as different group ID</refpurpose>
+  </refnamediv>
+  <!-- body begins here -->
+  <refsynopsisdiv id='synopsis'>
+    <cmdsynopsis>
+      <command>sg</command>
+      <arg choice='opt'>- </arg>
+      <arg choice='opt'>group
+	<arg choice='opt'>-c </arg>
+	command
+      </arg>
+    </cmdsynopsis>
+  </refsynopsisdiv>
+
+  <refsect1 id='description'>
+  <title>DESCRIPTION</title>
+    <para>
+      The <command>sg</command> command works similar to
+      <command>newgrp</command> but accepts a command. The command will be
+      executed with the <filename>/bin/sh</filename> shell. With most shells
+      you may run <command>sg</command> from, you need to enclose multi-word
+      commands in quotes. Another difference between
+      <command>newgrp</command> and <command>sg</command> is that some
+      shells treat <command>newgrp</command> specially, replacing themselves
+      with a new instance of a shell that <command>newgrp</command> creates.
+      This doesn't happen with <command>sg</command>, so upon exit from a
+      <command>sg</command> command you are returned to your previous group
+      ID.
+    </para>
+  </refsect1>
+
+  <refsect1 id='configuration'>
+    <title>CONFIGURATION</title>
+    <para>
+      The following configuration variables in
+      <filename>/etc/login.defs</filename> change the behavior of this
+      tool:
+    </para>
+    <variablelist>
+      &SYSLOG_SG_ENAB;
+    </variablelist>
+  </refsect1>
+
+  <refsect1 id='files'>
+    <title>FILES</title>
+    <variablelist>
+      <varlistentry>
+	<term><filename>/etc/passwd</filename></term>
+	<listitem>
+	  <para>User account information.</para>
+	</listitem>
+      </varlistentry>
+      <varlistentry>
+	<term><filename>/etc/shadow</filename></term>
+	<listitem>
+	  <para>Secure user account information.</para>
+	</listitem>
+      </varlistentry>
+      <varlistentry>
+	<term><filename>/etc/group</filename></term>
+	<listitem>
+	  <para>Group account information.</para>
+	 </listitem>
+      </varlistentry>
+      <varlistentry condition="gshadow">
+	<term><filename>/etc/gshadow</filename></term>
+	<listitem>
+	  <para>Secure group account information.</para>
+	</listitem>
+      </varlistentry>
+    </variablelist>
+  </refsect1>
+
+  <refsect1 id='see_also'>
+    <title>SEE ALSO</title>
+    <para>
+      <citerefentry>
+	<refentrytitle>id</refentrytitle><manvolnum>1</manvolnum>
+      </citerefentry>,
+      <citerefentry>
+	<refentrytitle>login</refentrytitle><manvolnum>1</manvolnum>
+      </citerefentry>,
+      <citerefentry>
+	<refentrytitle>newgrp</refentrytitle><manvolnum>1</manvolnum>
+      </citerefentry>,
+      <citerefentry>
+	<refentrytitle>su</refentrytitle><manvolnum>1</manvolnum>
+      </citerefentry>,
+      <citerefentry>
+	<refentrytitle>gpasswd</refentrytitle><manvolnum>1</manvolnum>
+      </citerefentry>,
+      <citerefentry>
+	<refentrytitle>group</refentrytitle><manvolnum>5</manvolnum>
+      </citerefentry><phrase condition="gshadow">,
+	<citerefentry>
+	  <refentrytitle>gshadow</refentrytitle><manvolnum>5</manvolnum>
+	</citerefentry>
+      </phrase>.
+    </para>
+  </refsect1>
+</refentry>