title: Handling arithmetic expressions in shell scripting
body: <p>Kindly tell me that is it necessary to use "expr" keyword.</p>
  
  <p>EG:-</p>
  
  <pre><code> echo `expr a*b`
  </code></pre>
  
  <p>And where we can simply handle arithmetic expressions using simple arithmetic operators.</p>
  
  <p>EG:- </p>
  
  <pre><code>echo a*b
  </code></pre>
  
  <p>Thanks in advance.</p>