title: How to compare two big files and get results to third file?
body: <p>I have two files</p>
  
  <p>1st file is like this:</p>
  
  <pre><code>www.example.com
  www.domain.com
  www.otherexample.com
  www.other-domain.com
  www.other-example.com
  www.exa-ample.com
  </code></pre>
  
  <p>2nd file is like this (numbers after ;;; are between 0-10):</p>
  
  <pre><code>www.example.com;;;2
  www.domain.com;;;5
  www.other-domain;;;0
  www.exa-ample.com;;;4
  </code></pre>
  
  <p>and i want compare these two files and output to third file like this:</p>
  
  <pre><code>www.otherexample.com
  www.other-example.com
  </code></pre>
  
  <p>Both files have large size (over 500mb)</p>