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<title>logresolve - Resolve IP-addresses to hostnames in Apache
log files - Apache HTTP Server</title>
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<p class="apache">Apache HTTP Server Version 2.1</p>
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<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs-project/">Documentation</a> > <a href="../">Version 2.1</a> > <a href="./">Programs</a></div><div id="page-content"><div id="preamble"><h1>logresolve - Resolve IP-addresses to hostnames in Apache
log files</h1>
<p><code>logresolve</code> is a post-processing program to
resolve IP-addresses in Apache's access logfiles. To minimize
impact on your nameserver, logresolve has its very own internal
hash-table cache. This means that each IP number will only be
looked up the first time it is found in the log file.</p>
<p>Takes an Apache log file on standard input. The IP addresses
must be the first thing on each line and must be seperated from
the remainder of the line by a space.</p>
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<h2><a name="synopsis" id="synopsis">Synopsis</a></h2>
<p><code><strong>logresolve</strong> [ -<strong>s</strong>
<var>filename</var> ] [ -<strong>c</strong> ] <
<var>access_log</var> > <var>access_log.new</var></code></p>
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<h2><a name="options" id="options">Options</a></h2>
<dl>
<dt><code>-s <var>filename</var></code></dt>
<dd>Specifies a filename to record statistics.</dd>
<dt><code>-c</code></dt>
<dd>This causes <code>logresolve</code> to apply some DNS checks:
after finding the hostname from the IP address, it looks up the IP
addresses for the hostname and checks that one of these matches the
original address.</dd>
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