non-www to www forwarding with nginx/apache

I would like to forward all instances of example.com to WWW.example.com with nginx/apache. Can someone let me know what the best practice is to get this done?



I came across this page here which seems to describe what is needed:



http://stackoverflow.com/questions/7...-www-to-no-www



...but I don't want to edit every instance of /usr/local/directadmin/data/users/user/nginx.conf manually, plus, I'd like to make sure that the change survives future updates by Custombuild.



Thanks in advance!

non-www to www forwarding with nginx/apache