title: Notepad++ - How can I replace blank lines
body: <p>I have a text file with a thousand lines of numbers like so:</p>
  
  <pre><code>402
  
  115
  
  90
  
  ...
  </code></pre>
  
  <p>As you can see there is a blank line in between each number that I want to remove so that I have </p>
  
  <pre><code>402
  115
  90
  ...
  </code></pre>
  
  <p>How can I do this?</p>