How to make HTTP Error 301 - Moved permanently Explained
Well, simply write in your .htaccess file the following:
RewriteEngine on
Options +FollowSymlinks
RewriteBase /
RewriteCond %{HTTP_HOST} ^site.com$
RewriteRule ^(.*)$ http://www.anothersite.com/$1 [R=301,L]
Tags: SEO, Apache, apache, htaccess