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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="unix_chkpwd">
<refmeta>
<refentrytitle>unix_chkpwd</refentrytitle>
<manvolnum>8</manvolnum>
<refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo>
</refmeta>
<refnamediv id="unix_chkpwd-name">
<refname>unix_chkpwd</refname>
<refpurpose>Helper binary that verifies the password of the current user</refpurpose>
</refnamediv>
<refsynopsisdiv>
<cmdsynopsis id="unix_chkpwd-cmdsynopsis">
<command>unix_chkpwd</command>
<arg choice="opt">
...
</arg>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1 id="unix_chkpwd-description">
<title>DESCRIPTION</title>
<para>
<emphasis>unix_chkpwd</emphasis> is a helper program for the
<emphasis>pam_unix</emphasis> module that verifies the
password of the current user. It also checks password and account
expiration dates in <emphasis>shadow</emphasis>. It is not intended to
be run directly from the command line and logs a security violation if
done so.
</para>
<para>
It is typically installed setuid root or setgid shadow.
</para>
<para>
The interface of the helper - command line options, and input/output
data format are internal to the <emphasis>pam_unix</emphasis>
module and it should not be called directly from applications.
</para>
</refsect1>
<refsect1 id='unix_chkpwd-see_also'>
<title>SEE ALSO</title>
<para>
<citerefentry>
<refentrytitle>pam_unix</refentrytitle><manvolnum>8</manvolnum>
</citerefentry>
</para>
</refsect1>
<refsect1 id='unix_chkpwd-author'>
<title>AUTHOR</title>
<para>
Written by Andrew Morgan and other various people.
</para>
</refsect1>
</refentry>
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