title: Use bash ´ls´ command in jupyter notebook?
body: <p>I just want to type the same bash command in jupyter which I also use in the bash terminal.</p>
  
  <p>I find the content of a folder in bash using this command and get the following output:</p>
  
  <p><code>&gt;&gt;&gt; ls data/bulldozers/
       Train.csv</code></p>
  
  <p>However when I use the same command in a jupyter notebook:</p>
  
  <pre><code>&gt;&gt;&gt; PATH = "data/bulldozers/"
      !ls {PATH}
  
      ls: data/bulldozers/: No such file or directory
  </code></pre>
  
  <p>What is the issue here?</p>