Mod rewrite Code Library

Code Library - Canonical Domain Sabotage

Security
Canonical Domain Sabotage (Duplicate Search Engine Penalties)

htaccess code
RewriteCond %{HTTP_HOST} !^www\.domain
RewriteCond %{HTTP_HOST} !^sub1\.domain [NC]
RewriteCond %{HTTP_HOST} !^sub2\.domain [NC]
RewriteCond %{HTTP_HOST} !^sub3\.domain [NC]
RewriteCond %{HTTP_HOST} !^sub4\.domain [NC]
RewriteCond %{HTTP_HOST} !^sub5\.domain [NC]
RewriteRule (.*) http //www.domain.com/$1 [R=301,L]

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Questions that are answered here:

How do I prevent duplicate penalties in the search engines for my website?
How do prevent Canonical Domain Sabotage?
How to redirect all non www. urls to www. urls on my site?
How to allow subdomains while redirecting non www. urls to www. urls?