nginx configure file is valid?
#!/bin/bash
sudo nginx -t
# valid
# nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
# nginx: configuration file /etc/nginx/nginx.conf test is successful
# invalid
# nginx: [emerg] unexpected "}" in /etc/nginx/sites-enabled/test.conf:4
# nginx: configuration file /etc/nginx/nginx.conf test failed