119 lines
3.9 KiB
XML
119 lines
3.9 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
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"http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd">
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<refentry id='su.1'>
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<!-- $Id: su.1.xml,v 1.15 2005/10/01 15:01:45 kloczek Exp $ -->
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<refmeta>
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<refentrytitle>su</refentrytitle>
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<manvolnum>1</manvolnum>
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<refmiscinfo class="sectdesc">User Commands</refmiscinfo>
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</refmeta>
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<refnamediv id='name'>
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<refname>su</refname>
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<refpurpose>change user ID or become super-user</refpurpose>
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</refnamediv>
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<refsynopsisdiv id='synopsis'>
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<cmdsynopsis>
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<command>su</command>
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<arg choice='opt'>- </arg>
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<arg choice='opt'>
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<arg choice='plain'>
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<replaceable>username</replaceable>
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</arg>
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<arg choice='opt'>
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<replaceable>args</replaceable>
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</arg>
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</arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1 id='description'>
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<title>DESCRIPTION</title>
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<para>
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<command>su</command> is used to become another user during a login
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session. Invoked without a username, <command>su</command> defaults to
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becoming the super user. The optional argument <option>-</option> may
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be used to provide an environment similar to what the user would
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expect had the user logged in directly.
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</para>
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<para>
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Additional arguments may be provided after the username, in which case
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they are supplied to the user´s login shell. In particular, an
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argument of <option>-c</option> will cause the next argument to be
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treated as a command by most command interpreters. The command will be
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executed by the shell specified in <filename>/etc/passwd</filename>
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for the target user.
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</para>
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<para>The user will be prompted for a password, if appropriate. Invalid
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passwords will produce an error message. All attempts, both valid and
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invalid, are logged to detect abuses of the system.
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</para>
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<para>
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The current environment is passed to the new shell. The value of
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<emphasis>$PATH</emphasis> is reset to
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<filename>/bin:/usr/bin</filename> for normal users, or
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<filename>/sbin:/bin:/usr/sbin:/usr/bin</filename> for the super user.
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This may be changed with the <emphasis>ENV_PATH</emphasis> and
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<emphasis>ENV_SUPATH</emphasis> definitions in
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<filename>/etc/login.defs</filename>.
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</para>
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<para>
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A subsystem login is indicated by the presence of a "*" as the first
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character of the login shell. The given home directory will be used as
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the root of a new file system which the user is actually logged into.
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</para>
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</refsect1>
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<refsect1 id='caveats'>
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<title>CAVEATS</title>
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<para>
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This version of <command>su</command> has many compilation options,
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only some of which may be in use at any particular site.
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</para>
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</refsect1>
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<refsect1 id='files'>
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<title>FILES</title>
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<variablelist>
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<varlistentry>
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<term><filename>/etc/passwd</filename></term>
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<listitem>
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<para>user account information</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><filename>/etc/shadow</filename></term>
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<listitem>
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<para>secure user account information</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1 id='see_also'>
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<title>SEE ALSO</title>
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<para><citerefentry>
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<refentrytitle>login</refentrytitle><manvolnum>1</manvolnum>
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</citerefentry>,
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<citerefentry>
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<refentrytitle>login.defs</refentrytitle><manvolnum>5</manvolnum>
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</citerefentry>,
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<citerefentry>
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<refentrytitle>sh</refentrytitle><manvolnum>1</manvolnum>
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</citerefentry>,
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<citerefentry>
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<refentrytitle>suauth</refentrytitle><manvolnum>5</manvolnum>
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</citerefentry>.
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</para>
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</refsect1>
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<refsect1 id='author'>
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<title>AUTHOR</title>
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<para>Julianne Frances Haugh <jockgrrl@ix.netcom.com></para>
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</refsect1>
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</refentry>
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