Options +FollowSymlinks
RewriteEngine On
RewriteCond %{HTTP_HOST} ^olddomain.com [NC]
RewriteRule ^(.*)$ http://newdomain.com/$1 [L,R=301]
RewriteCond %{HTTP_HOST} ^www.olddomain.com [NC]
RewriteRule ^(.*)$ http://newdomain.com/$1 [L,R=301