Best way to redirect a url (LAMP on debian)

What I've done with my domains is have a vhost setup for my main domain pointing at one directory, and the others "children" domains point at another directory, which has an index.php file that just 301 redirects to the main site. Might not be the nicest way to do it but I've read it doesnt hurt your SEO stats like other methods.

Good luck

Enable mod_rewrite and have something like this in your vhost configuration file (in /etc/apache2/sites-available):

ServerName mydomain.com
ServerAlias www.mydomain.com
ServerAlias mydomain.net
ServerAlias www.mydomain.net

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

Another method is to simply use Apache's RedirectMatch:

 <virtualhost *:80="">ServerName mydomain.net
ServerAlias mydomain.co
RedirectMatch permanent ^(.*)$ http://mydomain.com$1</virtualhost> 

 <virtualhost *:80="">ServerName mydomain.com
# Complete configuration here...</virtualhost> 

Would redirect all requests for mydomain.net and mydomain.co to mydomain.com

@sleddog:

Another method is to simply use Apache's RedirectMatch:

 <virtualhost *:80="">ServerName mydomain.net
ServerAlias mydomain.co
RedirectMatch permanent ^(.*)$ http://mydomain.com$1</virtualhost> 

 <virtualhost *:80="">ServerName mydomain.com
# Complete configuration here...</virtualhost> 

Would redirect all requests for mydomain.net and mydomain.co to mydomain.com

Thanks, I like that approach much better as I dont even need to have a separate directory structure for my extra domains, and my vhost file is much cleaner.