title: Basic Bash pipe tricks
body: <p><br/>
  I'm going to run a short demonstration of Linux to an audience of 9-10 y.o children at school. I guess none has never seen a shell, so for the fun of them I'd like to show how many things you can achieve with a one-liner pipe. <br/>
  I'd like to start with:</p>
  
  <pre><code>echo "Hello world"
  </code></pre>
  
  <p>and then:</p>
  
  <pre><code>echo "Hello world" | figlet
  echo "Hello world" | rev
  echo "Hello world" | mail johndoe@gmail.com
  </code></pre>
  
  <p>Can you suggest me any one-liner that I can use with echo ?
  Thanks a lot!</p>