title: !jupyter in jupyter notebook producing 'zsh:1: command not found: jupyter" error
body: <p>I have these lines in a jupyter workbook cell:</p>
  <pre><code>os.chdir('/Users/..../Documents/DATA/kr/kr_notebooks/kr_final/')
  
  !jupyter nbconvert \
  --TagRemovePreprocessor.enabled=True \
  --TagRemovePreprocessor.remove_cell_tags remove_cell \
  --to python kr_macro_website.ipynb \
  --stdout &gt; &quot;/Users/..../Documents/heroku/kr_macro/app/main.py&quot;
  </code></pre>
  <p>The cell was doing what I wanted, but I was trying to install R into jupyter, seem to have messed something up, and now get this error when running the cell:</p>
  <p>zsh:1: command not found: jupyter</p>
  <p>Is there a way to fix it?</p>