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<?xml version="1.0" encoding="UTF-8"?>
<!--
SPDX-FileCopyrightText: 1991 , Julianne Frances Haugh
SPDX-FileCopyrightText: 2007 - 2008, Nicolas François
SPDX-License-Identifier: BSD-3-Clause
-->
<!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='newgrp.1'>
<!-- $Id$ -->
<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>newgrp</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>newgrp</refname>
<refpurpose>log in to a new group</refpurpose>
</refnamediv>
<!-- body begins here -->
<refsynopsisdiv id='synopsis'>
<cmdsynopsis>
<command>newgrp</command> <arg choice='opt'>- </arg>
<arg choice='opt'><replaceable>group</replaceable></arg>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1 id='description'>
<title>DESCRIPTION</title>
<para>
The <command>newgrp</command> command is used to change the current
group ID during a login session. If the optional <option>-</option>
flag is given, the user's environment will be reinitialized as though
the user had logged in, otherwise the current environment, including
current working directory, remains unchanged.
</para>
<para>
<command>newgrp</command> changes the current real group ID to the
named group, or to the default group listed in
<filename>/etc/passwd</filename> if no group name is given.
<command>newgrp</command> also tries to add the group to the user
groupset. If not root, the user will be prompted for a password if she
does not have a password (in <filename>/etc/shadow</filename> if this
user has an entry in the shadowed password file, or in
<filename>/etc/passwd</filename> otherwise) and the group does, or if
the user is not listed as a member and the group has a password. The
user will be denied access if the group password is empty and the user
is not listed as a member.
</para>
<para condition="gshadow">
If there is an entry for this group in
<filename>/etc/gshadow</filename>, then the list of members and the
password of this group will be taken from this file, otherwise, the
entry in <filename>/etc/group</filename> is considered.
</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>su</refentrytitle><manvolnum>1</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>sg</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 condition="gshadow">
<refentrytitle>gshadow</refentrytitle><manvolnum>5</manvolnum>
</citerefentry>
</phrase>.
</para>
</refsect1>
</refentry>
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