title: Downgrade perl version on mac
body: <p>First of all am new to MAC.<br>
  Am facing similar kind of issue on Mac where its shipped with V5.28.0 but i have to use perl V5.18.2 for my application. Have installed perl 5.18.2 using <code>perlbrew install 5.18.2</code> and the installation was successful.     </p>
  
  <p>Have two questions here     </p>
  
  <ol>
  <li><p>Where are my default version and other version installed ? Is there any command to know them ? Have already tried checking echo $PATH but no use.    </p></li>
  <li><p>How to set the default version to 5.18.2 ?</p></li>
  </ol>
  
  <p>Regards<br>
  AVK</p>