Redirect sub-domain to main domain.. depending on URL

[Ben]

I've got a client's site that has it's own domain but "lives" at a sub-domain of my portfolio site, Google has helpfully started showing both top & sub domains - so I need to 'bounce' people away from the sub-domain (Google included) if they have come visiting sub.domain.com/whatever and only show if they visit the main domain name.

I don't think the usual 301 request would work?

Hopefully that makes a bit of sense..? 

[sarahA]

I think this should work. Put it in the htaccess in the root folder for your sub domain or possibly in the directory for the website (sorry, a bit out of touch with code these days!)

Code:

Options +FollowSymlinks
RewriteEngine On
RewriteBase /

#redirect whatever directory to the add-on domain
RewriteCond %{HTTP_HOST} ^sub.domain.com/whatever/? [NC]
RewriteRule ^(.*)$ http://www.correct-domain.co.uk/$1 [R=301,L]

Note, you only need the top part if you don't already have it in the htaccess file.

[JasonD]

RewriteCond %{HTTP_HOST} ^sub.domain.com$ [NC]

No path in HTTP_HOST.