title: shell script "tar" error while running in jinja2
body: <p>While running shell script in jinja2, I'm getting some errors.
  Commond is:</p>
  
  <pre><code>resultFilesPath=/var/data/output
  cd $resultFilesPath;
  tar czvf {% for tar_file in outputs.output %}{{ tar_file.path }} ./* {% endfor %};
  </code></pre>
  
  <p>error is:</p>
  
  <blockquote>
    <p>tar: Old option 'f' requires an argument.<br>
    Try 'tar --help' or 'tar --usage' for more information.</p>
  </blockquote>
  
  <p>I don't know the reason, please help me.</p>