title: How to replace Fixed String to NULL from Text File Through Batch File
body: <p>I have text File in that I want to replace NULL string with ""(NULL). The content of the text file as test.txt is :</p>
  
  <pre><code>abc,1234,qwe,NULL
  234,NULL,wer,jkl
  jkl,678,987,NULL
  </code></pre>
  
  <p>I am expecting my output in test.txt as follows:</p>
  
  <pre><code>abc,1234,qwe,
  234,,wer,jkl
  jkl,678,987,
  </code></pre>
  
  <p>I'm new to this, Kindly help me out thanks in advance</p>