Clear my hard drive without erasing osx?

I already upgraded to Mountain Lion and want to pass the 2011 MBP after getting my retina.  I want to erase everything but the Mountain Lion.  Obviously, no disks.  Any help?

revearp wrote:
I want to erase everything but the Mountain Lion.
Any programs you installed are still tied to you or if downloaded from AppStore (copy protected) can't be updated without your AppleID.
Hold command r keys while booting to get into Recovery partition and use Disk Utility there to erase your Macintosh HD partition with a middle or far right (longer) security erase option. This way everything is gone and the next person doesn't assume your identity online or use Data Rescue to recover files that were deleted.
https://support.apple.com/kb/HT4718
Then quit Disk Utility and reinstall Mountain Lion from Apple's servers using your AppleID for the next person to test with.
When they buy the machine do the same thing again, however you can select the far left faster erase function which only takes a few seconds as your previous data was already removed, you just want to remove 10.8 so they have to install it themselves with their AppleID and not yours.
I've covered a full range of deletion options here, including a Paranoid Section.
How do I securely delete data from the machine?

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