Piping not working with echo command : <p>When I run the following <code>Bash</code> script, I would expect it to print <code>Hello</code>.  Instead, it prints a blank line and exits.</p>

<pre><code>echo 'Hello' | echo
</code></pre>

<p>Why doesn't <code>piping</code> output from <code>echo</code> to <code>echo</code> work?</p>
