title: remove blank lines from multiple files within a specific directory
body: <p>I would like to use a batch file to delete all blank lines in multiple files in the directory "Data".  I don't want to rename the files.  </p>
  
  <p>I have seen this post, but it does not help: <a href="https://stackoverflow.com/questions/12118686/how-to-delete-blank-lines-from-multiple-files-in-a-directory">How to delete blank lines from multiple files in a directory</a> for the following reasons:
  * Files are renamed
  * Files must be in same directory as the .bat file</p>
  
  <p>If you could also explain the batch file commands, then that would be greatly appreciated.</p>
  
  <p>Thanks.</p>