title: How do I change bash history completion to complete what's already on the line?
body: <p>I found a command a couple of months ago that made my bash history auto-complete on what's already on the line when pressing the up arrow: </p>
  
  <pre><code>$ vim fi
  </code></pre>
  
  <p>Press <kbd>↑</kbd></p>
  
  <pre><code>$ vim file.py
  </code></pre>
  
  <p>I'd like to set this up on my new computer, because it saves a lot of time when keeping a big history. The problem is that I can't for the life of me remember where it was mentioned and reading through endless bash references and tutorials unfortunately didn't help either.</p>
  
  <p>Does anybody know the command?</p>