Just start and run nginx directly, no need to add signal

There is no need to add the -s parameter, -s is a signal, and reload is to reload the configuration file.

Start nginx

If your nginx configuration file is in /etc/nginx/nginx.conf，启动nginx就可以nginx -c /etc/nginx/nginx.conf

nginx signal

nginx -s is to send a signal to nginx
nginx -s stop to stop immediately
nginx -s quit to stop gracefully
nginx -s reload to reread the configuration file

Delete the pid file in the corresponding directory, and then nginx start

Execute the following command

kill -9 $(pgrep nginx)
nginx

First, kill the started nginx process, and then directly execute the nginx command to restart nginx.