how to see port use by nginx in ubuntu code example

Example 1: chaneg default port on nginx

# vi /etc/nginx/sites-enabled/default  [On Debian/Ubuntu]
# vi /etc/nginx/nginx.conf             [On CentOS/RHEL]

Example 2: chaneg default port on nginx

# systemctl restart nginx
# netstat -tlpn| grep nginx
# ss -tlpn| grep nginx

Example 3: chaneg default port on nginx

listen 3200 default_server;