title: Watch a web page for changes
body: <p>I googled and couldn't find any could that would compare a webpage to a previous version.</p>
  
  <p>In this case the page I'm trying to watch is <a href="http://www.ponderosapm.com/AvailableRentalsData.htm" rel="nofollow noreferrer">link text</a>.  There are services that can watch a page, but I'd like to set this up on my own server.</p>
  
  <p>I've set this up as a wiki so anyone can add to the code.  Here's my idea</p>
  
  <ol>
  <li>Check if previous version of file exists.  If false then download page</li>
  <li>If page exists, diff to find differences and email the new content along with dates of new and old versions.</li>
  </ol>
  
  <p>This script would be called nightly via cron or on-demand via the browser (the latter is not a priority)</p>
  
  <p>Sounds simple, maybe I'm just not looking in the right place.</p>