title: how to convert 23/1/17 to 23/01/2017 in a row of csv file with unix?
body: <p>I am looking for how to convert all dates in a csv file row into this format ? example I want to convert 23/1/17 to 23/01/2017</p>
  <p>I use unix</p>
  <p>thank you</p>
  <p>my file is like this :</p>
  <p>23/1/17
  17/08/18
  1/1/2
  5/6/03
  18/05/2019</p>
  <p>and I want this :</p>
  <p>23/01/2017
  17/08/2018
  01/01/2002
  05/06/2003
  18/05/2019</p>