title: How to sort,uniq and display line that appear more than X times
body: <p>I have a file like this:</p>
  
  <pre><code>80.13.178.2
  80.13.178.2
  80.13.178.2
  80.13.178.2
  80.13.178.1
  80.13.178.3
  80.13.178.3
  80.13.178.3
  80.13.178.4
  80.13.178.4
  80.13.178.7
  </code></pre>
  
  <p>I need to display unique entries for repeated line (similar to uniq -d) but only entries that occur <em>more</em> than just twice (twice being an example so flexibility to define the lower limit.)</p>
  
  <p>Output for this example should be like this when looking for entries with three or more occurrences: </p>
  
  <pre><code>80.13.178.2
  80.13.178.3
  </code></pre>