.htaccess 301 redirect all pages on old domain to a single page on new domain - apache

Question

I'm looking to redirect each and every page on the old domain to a single page on the new domain. It should also redirect both the www and non-www versions. Every single request to the domain old.com, whatever it may be, should lead to www.new.com root.
old.com/1.php
www.old.com/2.php
old.com/2.php
old.com/links/index.php
old.com/about-us.html
old.com/?string=1
should all redirect to:
www.new.com/
I'm looking for a .htaccess solution.

Answer 1

You can use RedirectMatch in the old.com vhost
RedirectMatch permanent .* http://www.new.com/
Redirect appends the trailing portion of the matched URI to the redirection URI but with RedirectMatch it's up to you to choose the parts (if any) that you want to transfer using parentheses and $number references.
If the old and new domains must be aliases for the same document root on disk then you'll probably have to use mod_rewrite
RewriteEngine on
RewriteCond %{HTTP_HOST} old\.com$
RewriteRule .* http://www.new.com/ [L,R=301]

Answer 2

This has already been answered, but here's the code altogether containing helpful comments so people have a reference to look back on later should they forget what it does.
Put this in your .htaccess file:
## Each and every page on old domain redirects to single page
## By appending question mark to new domain, query strings are removed
RewriteEngine on
RewriteCond %{HTTP_HOST} old\.com$
RewriteRule .* http://www.new.com/? [L,R=301]
You can also redirect to a sub directory on another domain, as was the case that I needed to do like this:
## Each and every page on old domain redirects to single page
## By appending question mark to new domain, query strings are removed
RewriteEngine on
RewriteCond %{HTTP_HOST} old\.com$
RewriteRule .* http://www.new.com/sub-directory/? [L,R=301]

Answer 3

This will handle all your redirects including query strings. Excuse the formatting, I'm on a phone :)
RewriteCond %{HTTP_HOST} old\.com$ RewriteCond %{QUERY_STRING} .+
RewriteRule (.*) http://www.new.com$1?%{QUERY_STRING} [L,R=301,QSA]
RewriteCond %{HTTP_HOST} old\.com$
RewriteRule (.*) http://www.new.com$1 [L,R=301,QSA]