$ bundle exec jekyll serve --detach && echo "jekyll detached"
Configuration file: /path/to/site/_config.yml
To use retry middleware with Faraday v2.0+, install `faraday-retry` gem
            Source: /path/to/site
       Destination: /path/to/site/_site
 Incremental build: disabled. Enable with --incremental
      Generating...
                    done in 1.411 seconds.
 Auto-regeneration: disabled when running server detached.
    Server address: http://127.0.0.1:4000/
Server detached with pid '77748'. Run `pkill -f jekyll' or `kill -9 77748' to stop the server.