title: How can I convert kbyte -> gbyte all values on same column
body: <p>I have log file like this:</p>
  
  <pre><code>...
  h,7,0,0,0
  h,8,0,0,0
  h,9,1420617572,113390,9777
  h,10,1420621172,546702,26577
  h,11,1420621754,2746,2786
  h,12,0,0,0
  ...
  </code></pre>
  
  <p>Last 2 column kbyte values. I need to update all last 2 column values kB to gB.</p>
  
  <p>Any suggestion(awk,sed,etc.) for convert and update with column number?</p>