title: Difference between CMD echo 'Hello world' and CMD ["echo", ''Hello world'] in a dockerfile?
body: <p>Just I would like to know if there is some difference behind the scenes between doing:</p>
  
  <pre><code>CMD echo 'Hello world'
  </code></pre>
  
  <p>and</p>
  
  <pre><code>CMD ['echo', 'Hello World']
  </code></pre>
  
  <p>I know that both will print it on the console , but if there is some difference, when use each option?</p>