bash: the difference between "<" and "<<<" redirect : <p>This code in bash read and process lines in a variable  </p>

<pre><code>while read -r line; do
    echo "... $line ..."
done &lt;&lt;&lt; "$list"
</code></pre>

<p>If i replace &lt;&lt;&lt; with &lt;, it does not work. Wonder why is that</p>
