Nginx Force (Redirect) WWW.Domain.COM To Domain.COM

I know how to force and redirect www.example.com to example.com under Lighttpd web server. How do I force nginx web server to redirect www.example.com/page/1/2/3 to example.com/page/1/2/3?

You can easily redirect www to nowww domain for SEO and other purposes using the following syntax. Edit nginx.conf file, enter:
# vi /usr/local/nginx/conf/nginx.conf
To force www.theos.in/page.html to theos.in/page.html, enter:

### redirect www to nowww with client code 301 ###
      if ($host = 'www.theos.in' ) {
         rewrite  ^/(.*)$  http://theos.in/$1  permanent;
      }
 

Save and close the file. Test and reload nginx webserver, enter:
# /usr/local/nginx/sbin/nginx -s reload
Fire a webbrowser and type the url:
http://www.theos.in/windows-xp/free-fast-public-dns-server-list/
It should be redirected to
http://theos.in/windows-xp/free-fast-public-dns-server-list/