title: sed search and replace specific column only
body: <p>Im taking weather day from wunderground.com and I and then trimming down the data for use on gnuplot. Im having trouble replacing the second column only data from number to months abbreviations. Only interested in the second column.</p>
  
  <p>I want to go from this;</p>
  
  <pre><code>&gt;2013 08 02 23 37 00 73.3
  &gt;2013 08 02 23 42 00 73.4
  &gt;2013 08 02 23 45 00 73.3
  &gt;2013 08 02 23 47 00 73.1
  &gt;2013 08 02 23 52 00 73.1
  &gt;2013 08 02 23 57 00 73.1
  </code></pre>
  
  <p>To this:</p>
  
  <pre><code>&gt;2013 AUG 02 23 37 00 73.3
  &gt;2013 AUG 02 23 42 00 73.4
  &gt;2013 AUG 02 23 45 00 73.3
  &gt;2013 AUG 02 23 47 00 73.1
  &gt;2013 AUG 02 23 52 00 73.1
  &gt;2013 AUG 02 23 57 00 73.1
  </code></pre>
  
  <p>i am trying to use sed to change the numbers into the correct month and i keep getting this. I only want the correct sed expression to execute not all of them. This is the command i am trying to use.</p>
  
  <pre><code>sed -e 's/01/JAN/' -e 's/02/FEB/' -e 's/03/MAR/' -e 's/04/APR/' -e 's/05/MAY/' -e 's/06/JUN/' -e 's/07/JUL/' -e 's/08/AUG/' -e 's/09/SEP/' -e 's/10/OCT/' -e 's/11/NOV/' -e 's/12/DEC/'
  </code></pre>
  
  <p>How would i go about this.</p>