title: Compare two CSV files and show only the difference
body: <p>I have two <a href="http://en.wikipedia.org/wiki/Comma-separated_values" rel="nofollow">CSV</a> files:</p>
  
  <h3>File1.csv</h3>
  
  <pre><code>Time, Object_Name, Carrier_Name, Frequency, Longname
  
  2013-08-05 00:00, Alpha, Aircel, 917.86, Aircel_Bhopal
  
  2013-08-05 00:00, Alpha, Aircel, 915.13, Aircel_Indore
  </code></pre>
  
  <h3>File2.csv</h3>
  
  <pre><code>Time, Object_Name, Carrier_Name, Frequency, Longname
  
  2013-08-05 00:00, Alpha, Aircel, 917.86, Aircel_Bhopal
  
  2013-08-05 00:00, Alpha, Aircel, 815.13, Aircel_Indore
  </code></pre>
  
  <p>These are sample input files in actual so many headers and values will be there, so I can not make them hard coded.</p>
  
  <p>In my expected output I want to keep the first two columns and the last column as it is as there won't be any change in the same and then the comparison should happen for the rest of the columns and values.</p>
  
  <p>Expected output:</p>
  
  <pre><code>Time, Object_Name, Frequency, Longname
  
  2013-08-05 00:00, 815.13, Aircel_Indore
  </code></pre>
  
  <p>How can I do this?</p>