title: How to nest a variable in another variable for parameter passing?
body: <p>say we have:</p>
  
  <pre><code>test() {
      echo $1
      echo $2
  }
  </code></pre>
  
  <p>and two variables:</p>
  
  <pre><code>a="hello world"
  b="$a blabla.."
  
  test $b
  </code></pre>
  
  <p>it displays:</p>
  
  <pre><code>hello
  world
  </code></pre>
  
  <p>what I want is:</p>
  
  <pre><code>hello world
  blabla..
  </code></pre>
  
  <p>How can I achieve this?</p>
  
  <p>Thanks</p>