Number of visitors per hour
<p>I have a server log formatted like this:</p>

<pre>
128.33.100.1 2011-03-03 15:25 test.html  
</pre>

<p>I need to extract several things from it but I am mostly stuck on how to get the total number of visits per hour as well as the number of unique visitors per page. Any pointers would be appreciated.</p>
