The detailed steps of uninstalling nginx under Linux, the pro-test is effective

1. Check whether the nginx service is running, and shut down the service if it is running.

ps -ef|grep nginx
/usr/local/nginx/sbin/nginx -s stop

2. Find and delete nginx related files.

whereis nginx 
find / -name nginx 
rm -rf /usr/local/nginx

3. Uninstall nginx dependencies.

yum remove nginx

At this point, nginx has been uninstalled, and other versions of nginx services can be reinstalled.

How to install the nginx service correctly, please see here: Detailed steps to install nginx under Linux