Redirecting all domain aliases to one with htaccess

Question

I have a few domain aliases, while I only want one of them to be actually used. At the moment, I have two domains installed,

To redirect I\'d like to use htaccess.

Answer 1

It is a simple matter of matching %{HTTP_HOST} not equal to www.domain.com and redirecting that to the canonical domain.

RewriteEngine On
# If the hostname is NOT www.domain.com
RewriteCond %{HTTP_HOST} !^www\.domain\.com$
# 301 redirect to the same resource on www.domain.com
RewriteRule (.*) http://www.domain.com/$1 [L,R=301]