title: Run vim command on every line in a vim buffer
body: <p>I want to <code>JJ</code> on every line in the current vim buffer. As I have very huge file, it is not possible to manually run on every line. How can I tell vim to do this for me?
  Basically I have a file which has data in single column. I want to convert it to three columns</p>
  
  <pre><code>a
  b
  c
  </code></pre>
  
  <p>to:</p>
  
  <pre><code>a b c
  </code></pre>