title: shell string and program execute
body: <p>The following code is used to create a file in exactly location.However result of running test.sh abc is </p>
  
  <blockquote>
    <p>touch: missing file operand</p>
  </blockquote>
  
  <pre><code>#! /bin/sh
  #test.sh
  location='~/configuration/'$1
  echo $location
  touch `$location`
  </code></pre>
  
  <p>Is there anything wrong?Thanks!</p>