title: Making a bash script switch to interactive mode and give a prompt
body: <p>I am writing a training tool, it is written in bash to teach bash/unix. </p>
  
  <p>I want a script to run to set things up, then to hand control to the user. 
  I want it to be easily runnable by typing <code>./script-name</code></p>
  
  <p>How do I do this?</p>
  
  <p>I.E.</p>
  
  <ul>
  <li>User types: <code>tutorial/run</code></li>
  <li>The run-tutorial script sets things up.</li>
  <li>The user is presented with a task. (this bit works)</li>
  <li>The command prompt is returned, with the shell still configured.</li>
  </ul>
  
  <p>Currently it will work if I type <code>. tutorial/bashrc</code></p>