title: display only lines from output that contains a specified word
body: <p>I'm looking for a way to get only the lines that contains a specified word, in this case all lines that contains the word <em>Stream</em> from an output</p>
  <p>I've tried;</p>
  <pre><code>streams=$(ffprobe -i  &quot;movie.mp4&quot;  | grep &quot;Stream&quot;)
  </code></pre>
  <p>but that didn't get any results..</p>
  <p>or do I need to output it to a file and then try to extract the lines I'm looking for?</p>