title: Batch processing multiple lines to a single line?
body: <p>In batch (.bat) if I have a file that looks like this:</p>
  
  <pre>
  test1
  test2
  test3
  </pre>
  
  <p>How can I rewrite the content of that file to be on the same line? e.g:</p>
  
  <pre>test1, test2, test3</pre>
  
  <p><br />
  Thanks in advance!<br />
  Niklas</p>