Gracefully restart Nginx

Follow these 3 steps to gracefully stop and start Nginx without losing any queries. It works like a charm.

1. Test new configuration is correct
   nginx -t
2. Find the Pid
   ps -ef | grep "nginx: master process" | grep -v "grep" | awk -F ' ' '{print $2}'
3. And kill it. Meanwhile, new configuration is already effective.
   kill -HUP ????
   (replace ???? with the Pid given in step 2)