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[svn-upgrade] Integrating new upstream version, shadow (4.0.9)

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nekral-guest
2007-10-07 11:46:16 +00:00
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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
"http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd">
<refentry id='su.1'>
<!-- $Id: su.1.xml,v 1.8 2005/05/19 10:35:00 kloczek Exp $ -->
<refmeta>
<refentrytitle>su</refentrytitle>
<manvolnum>1</manvolnum>
<refmiscinfo class="sectdesc">User Commands</refmiscinfo>
</refmeta>
<refnamediv id='name'>
<refname>su</refname>
<refpurpose>change user ID or become super-user</refpurpose>
</refnamediv>
<refsynopsisdiv id='synopsis'>
<cmdsynopsis>
<command>su</command>
<arg choice='opt'>- </arg>
<arg choice='opt'>
<arg choice='plain'>
<replaceable>username</replaceable>
</arg>
<arg choice='opt'>
<replaceable>args</replaceable>
</arg>
</arg>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1 id='description'>
<title>DESCRIPTION</title>
<para>
<command>su</command> is used to become another user during a login
session. Invoked without a username, <command>su</command> defaults to
becoming the super user. The optional argument <option>-</option> may
be used to provide an environment similar to what the user would
expect had the user logged in directly.
</para>
<para>Additional arguments may be provided after the username, in which
case they are supplied to the user&acute;s login shell. In particular,
an argument of <option>-c</option> will cause the next argument to be
treated as a command by most command interpreters. The command will be
executed by the shell specified in <filename>/etc/passwd</filename>
for the target user.
</para>
<para>The user will be prompted for a password, if appropriate. Invalid
passwords will produce an error message. All attempts, both valid and
invalid, are logged to detect abuses of the system.
</para>
<para>The current environment is passed to the new shell. The value of
<emphasis remap='B'>$PATH</emphasis> is reset to
<filename>/bin:/usr/bin</filename> for normal users, or
<filename>/sbin:/bin:/usr/sbin:/usr/bin</filename> for the super user.
This may be changed with the <emphasis remap='B'>ENV_PATH</emphasis>
and <emphasis remap='B'>ENV_SUPATH</emphasis> definitions in
<filename>/etc/login.defs</filename>.
</para>
<para>A subsystem login is indicated by the presense of a "*" as the
first character of the login shell. The given home directory will be
used as the root of a new filesystem which the user is actually logged
into.
</para>
</refsect1>
<refsect1 id='caveats'>
<title>CAVEATS</title>
<para>
This version of <command>su</command> has many compilation options,
only some of which may be in use at any particular site.
</para>
</refsect1>
<refsect1 id='files'>
<title>FILES</title>
<variablelist>
<varlistentry>
<term><filename>/etc/passwd</filename></term>
<listitem>user account information</listitem>
</varlistentry>
<varlistentry>
<term><filename>/etc/shadow</filename></term>
<listitem>secure user account information</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 id='see_also'>
<title>SEE ALSO</title>
<para>
<citerefentry>
<refentrytitle>login</refentrytitle><manvolnum>1</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>sh</refentrytitle><manvolnum>1</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>login.defs</refentrytitle><manvolnum>5</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>suauth</refentrytitle><manvolnum>5</manvolnum>
</citerefentry>
</para>
</refsect1>
<refsect1 id='author'>
<title>AUTHOR</title>
<para>Julianne Frances Haugh &lt;jockgrrl@ix.netcom.com&gt;</para>
</refsect1>
</refentry>