title: Search across multiple pdfs with indexing
body: <p>I have 20,000 pdf files in a directory tree. I need to search through them, fast. It could be a GUI program running under Windows, or a command line interface running under Windows or Cygwin (or even a Java or Ruby library). The catch is, it needs to implement indexing. (Or I need a quick shell script to  implement indexing and another one to search through the index).</p>
  
  <p>Adobe Reader would work great, only is there any way to allow for indexing?</p>
  
  <p>EDIT: I found <em>an</em> answer that works for my 64 bit Windows 7: <a href="http://www.documentsnap.com/how-to-fix-pdf-search-in-windows-7-64-bit/" rel="nofollow">http://www.documentsnap.com/how-to-fix-pdf-search-in-windows-7-64-bit/</a>  </p>
  
  <p>Still, my question about shell script still stands.</p>