title: How to add a number and rearrange a date in linux?
body: <p>When I do this:</p>
  <pre><code> a=cut -c 25-31 &lt;&lt;&lt; 'REFDV.UJH.c01r00.GLOBAL.2000.06.99.9999.MLM.10KM.ZZ00.MM1.00.nc'
  </code></pre>
  <p>I got  echo a</p>
  <pre><code> 2000.06
  </code></pre>
  <p>I would like to systematically return a as</p>
  <pre><code>   01062000 
  </code></pre>
  <p>always add 01 and arrange it differently</p>