I have domain.com and domain.org as aliases pointing to the same vhost. How can I use .htaccess to redirect all domain.com requests to domain.org?
You could use mod_rewrite to do this.
RewriteEngine on
RewriteCond %{HTTP_HOST} !^example\.org$
RewriteRule ^ http://example.org%{REQUEST_URI} [L,R=301]
This rule redirects every request that’s not addressed to example.org
to the very same.