title: base 64 decoding in shell scripting
body: <p>For Example I have a file like as follows .    </p>
  
  <pre><code>A,Y29tLz9hPTQ2JmM9NDQzNzgmczE9Q0,123  
  B,FJNLTA2MjQyMDE3LVAmczI9ODQ3MDA,321
  </code></pre>
  
  <p>I want to print field1,field2(by  base 64 decoding),field3 </p>
  
  <p>Output Required ::</p>
  
  <pre><code>A,result of base 64 decode,123
  B,result of base 64 decode,321
  </code></pre>