title: How to find-replace delimiter inside a column in unix file
body: <p>I have a unix file and ',' is the delimiter with 7 columns. How could i replace a column lets say column 3 which has ',' in it to some other character?</p>
  
  <p>ex: col1,col2,col3,col4...
  100,'xyz','sample,data',5000,</p>
  
  <p>replace , in sample,data to some character.</p>
  
  <p>Thanks</p>