title: Difference between single quotes and double quotes
body: <p>I have two variables declared in shell script</p>
  
  <pre><code>var1=23
  var2=27
  
  echo $var1              # Prints 23
  echo '$var1'            # Prints $var1
  echo "$var1"            # Prints 23
  </code></pre>
  
  <p>From the above I have some confusion regarding single and double quotes usage on variables.</p>
  
  <p>please can any one clarify this with an example difference between single and double quote.</p>