title: tar: Unrecognized archive format error when trying to unpack flower_photos.tgz, TF tutorials on OSX
body: <p>I'm trying to unpack the flower_photos.tgz after curling it using </p>
  
  <pre><code>curl -O http://download.tensorflow.org/example_../images/flower_photos.tgz
  tar xzf flower_photos.tgz
  </code></pre>
  
  <p>This is from the image retraining tutorial for TensorFlow</p>
  
  <p>Results from curling</p>
  
  <pre><code>% Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                               Dload  Upload   Total   Spent    Left  Speed
  100   127  100   127    0     0    255      0 --:--:-- --:--:-- --:--:--   255
  </code></pre>
  
  <p>Then when I try to unpack</p>
  
  <pre><code>tar xzf flower_photos.tgz
  tar: Unrecognized archive format
  tar: Error exit delayed from previous errors.
  </code></pre>