Set up a permanent 301 redirect via .htaccess

Add the following code in your .htaccess file:

RewriteEngine on
RewriteCond %{HTTP_HOST} ^example.com [NC,OR]
RewriteCond %{HTTP_HOST} ^www.example.com [NC]
RewriteRule ^(.*)$ http://example.net/$1 [L,R=301,NC]

Replace example.com by the “old” domain and example.net by the “new” domain.

Source : http://www.inmotionhosting.com/support/website/redirects/setting-up-a-301-permanent-redirect-via-htaccess