title: Merging PDF's in multiple locations with pdftk
body: <p>I'm trying to merge multiple PDF's calling pdftk from a batch or VBS script file.
  The issue is that the PDF's are all located in subfolders within a common parent directory. Example: <em>parent folder > subfolder1, subfolder2, subfolder3</em>, where the script/BAT file is located in <em>parent folder</em> and each <em>subfolder</em> contains a PDF.</p>
  
  <p>pdftk is called as follows: <em>pdftk.exe</em> *<em>.pdf cat output OutputFile.pdf</em></p>
  
  <p>This will merge only the PDF's in the current directory though, and not in the subfolders.
  Is there a way to do one of the following:</p>
  
  <ol>
  <li>Use the VBS/BAT file to copy all PDF's in the subfolders to another directory, and not error-out if some of the subfolders are empty</li>
  <li>Have pdftk look through the subfolders to select the PDF's to merge</li>
  </ol>
  
  <p>Any help would be appreciated.</p>