how do I switch subdomains using mod rewrite

[shagreel]

I am trying to move certain content from one subdomain to another using mod rewrite. I am just wondering if there is a good way to do this?

I would like any traffic going to a.example.com/test to be 301 redirected to b.example.com/test

Thanks for any help,
paul

[jdMorgan]

Use RewriteCond in mod_rewrite, testing the %{HTTP_HOST} variable for "^a\.example\.com" followed by a RewriteRule of all URL-paths to b.example.com/same-URL-paths with a permanent redirect.

Jim