Machine OS: Ubuntu 12.04 LTS

rm -rf 
this command killing. May cause corruption in the system especially when using Ubuntu at virtual machine.
Can use it as following:

sudo rm -rf /etc/nginx

This will remove all of the stuffs inside directory /etc/nginx. It also remove "nginx" folder. This including removing the configuration files like "clean all things inside".

But the service still running. Doing sudo apt-get remove nginx is not enough. It does not remove the service.

Stop the service:

sudo service nginx stop

This automatically check available nginx services:

sudo update-rc.d -f nginx remove

This remove the services:

sudo update-rc.d -f nginx remove
sudo rm /etc/init.d/nginx

Uninstall all using purge:

sudo apt-get purge nginx nginx-common nginx-full

Reinstall back:

sudo apt-get install nginx