title: How to count number of file in a bucket-folder with gsutil
body: <p>Is there an option to count the number of files in bucket-folders?  </p>
  
  <p>Like: </p>
  
  <pre><code>gsutil ls -count -recursive gs://bucket/folder
  
  Result:   666 files
  </code></pre>
  
  <p>I just want an total number of files to compare the
  amount to the sync-folder on my server.</p>
  
  <p>I don't get it in the manual.</p>