title: Is "xargs" on MacOS not the same as linux?
body: <p>For the following command:</p>
  
  <p><code>docker ps -a -q | xargs -r docker kill</code></p>
  
  <p>I get this error:</p>
  
  <p><code>xargs: illegal option -- r</code></p>
  
  <p>What would be the MacOS equivalent of the above command?</p>