How to redirect URLs through .htaccess? -

i want change domain name of website.

i want .htaccess redirect urls new domains in such way that:

when users click on urls http://old-domain.com/my-site-link/ redirects http://new-domain.com/my-site-link/

and when users click on urls http://old-domain.com/my-site-link.php redirects http://new-domain.com/my-site-link.php

new domain used , old domain not.

how possible? code .htaccess?

if both domains on same account , same root folder can use this:

rewriteengine on rewritecond %{http_host} ^(www\.)?old-domain\.com$ [nc] rewriterule ^(.*)$ http://new-domain.com/$1 [r=301,qsa,l] 

if domains on either different accounts or hosting services can simple add rule old domain .htaccess.

rewriteengine on rewritebase / rewriterule ^(.*)$ http://new-domain.com/$1 [r=301,qsa,l]