title: bash: grep only lines with certain criteria
body: <p>I am trying to grep out the lines in a file where the third field matches certain criteria.
  I tried using grep but had no luck in filtering out by a field in the file.
  I have a file full of records like this:</p>
  
  <pre><code>12794357382;0;219;215
  12795287063;0;220;215
  12795432063;0;215;220
  </code></pre>
  
  <p>I need to grep only the lines where the third field is equal to 215 (in this case, only the third line)</p>
  
  <p>Thanks a lot in advance for your help!</p>