title: Conversion of date format using sed or awk
body: <p>I am new to unix and i am searching for an answer for the below problem.</p>
  
  <p>I have a semi colon delimited file as below</p>
  
  <pre><code>Frank;01012019;01012020;woodcrest wack st
  Mark;01012019;01012020;Annunciation st
  Fred;01022019;01012020;Baker st
  </code></pre>
  
  <p>The date format in the input file is in DDMMYYYY format. I need the date to be converted into YYYYMMDD format as below.</p>
  
  <p>Expected Output:</p>
  
  <pre><code>Frank;20190101;20200101;woodcrest wack st
  Mark;20190101;20200101;Annunciation st
  Fred;20190201;20200101;Baker st
  </code></pre>
  
  <p>Please suggest me answers using sed or awk command.</p>