title: Number of visitors per hour
body: <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>