title: In shell, split a portion of a string with dot as delimiter
body: <p>I am new to shell scripting, can you please help with below requirement, thanks.</p>
  
  <pre><code>$AU_NAME=AU_MSM3-3.7-00.01.02.03
  #separate the string after last "-", with "." as delimiter
  #that is, separate "00.01.02.03" and print/save as below.
  major=00
  minor=01
  micro=02
  build=03
  </code></pre>