title: Shell Scripting - less than operation not working
body: <pre><code>echo "Enter age"
  read $ag
  
  if [[ $ag -lt 30 ]]
  
  then
  echo "Age is less than 30"
  
  else
  echo "not"
  
  fi
  </code></pre>
  
  <p>For this program, whatever be the value of 'ag', the output is shown as "Age is less than 30".
  What could be reason? and a solution?</p>