What's the .htaccess that will solve double Google index?

Here's the situation.

My primary domain in a webhost is example.com (just a sample)

I built a website subdomain.example.com

Google has been indexing the website as subdomain.example.com

However, Google is also indexing example.com/subdomain

How to stop Google and other search engines from indexing example.com/subdomain? Is an .htaccess the solution? Or there is another way of fixing it?

I am afraid I would be penalized for duplicate content.

 

You can just redirect it to the subdomain:

redirect 301 /subdomain/ http://subdomain.example.com

 

What is the code to use?

 

That's the code Just place that line in your htaccess file.

redirect 301 /subdomain/ http://subdomain.example.com

Code (markup):

 

Oh, thanks premiumscripts. Should I do the same thing to all my subdomains?

 

Yeah, but just test this one first. If it works, OK, add the others, if it doesn't, remove the line again.

 

If it doesn't work, do you have an alternative solution? Thanks again, premiumscripts!

 

Not at the moment, if it doesn't work, just post in this thread again

 

I see. Thanks premiumscripts for the tip.

 

It seems that the code is working. I still have to find out whether Google has stopped indexing the folder.

 

Good! Well, it'll be 301 redirecting to the subdomain, so eventually (in a couple of weeks) it should be gone from the googl index

 

An alternative is to specify the canonical address using a <meta> tag.

http://googlewebmastercentral.blogspot.com/2009/02/specify-your-canonical.html