title: What does "shell out" or "shelling out" mean?
body: <p>As used in these examples, for instance:</p>
  
  <blockquote>
    <p>shell out to bundle from inside a command invoked by bundle exec</p>
  </blockquote>
  
  <p>or</p>
  
  <blockquote>
    <p>shell out to a Ruby command that is not part of your current bundle, </p>
  </blockquote>
  
  <p><a href="http://bundler.io/man/bundle-exec.1.html" rel="noreferrer">http://bundler.io/man/bundle-exec.1.html</a></p>
  
  <p>or</p>
  
  <blockquote>
    <p>i'm shelling out to the heroku command in the rake task</p>
  </blockquote>
  
  <p><a href="https://github.com/sstephenson/rbenv/issues/400" rel="noreferrer">https://github.com/sstephenson/rbenv/issues/400</a></p>