title: Converting hex to decimal in awk or sed
body: <p>I have a list of numbers, comma-separated:</p>
  
  <pre><code>123711184642,02,3583090366663629,639f02012437d4
  123715942138,01,3538710295145500,639f02afd6c643
  123711616258,02,3548370476972758,639f0200485732
  </code></pre>
  
  <p>I need to split the 3rd column into three as below:</p>
  
  <pre><code>123711184642,02,3583090366663629,639f02,0124,37d4
  123715942138,01,3538710295145500,639f02,afd6,c643
  123711616258,02,3548370476972758,639f02,0048,5732
  </code></pre>
  
  <p>And convert the digits in the last two columns into decimal:</p>
  
  <pre><code>123711184642,02,3583090366663629,639f02,292,14292
  123715942138,01,3538710295145500,639f02,45014,50755
  123711616258,02,3548370476972758,639f02,72,22322
  </code></pre>