Permanent redirect to www domain

You have a domain anydomain.com, and you want a permanent redirect (301) to www.anydomain.com. You can do this using a .htaccess file. Here it is:

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

So if someone types anydomain.com, he will be redirected to www.anydomain.com. easy.