How to reset Lion back to the Setup Assistant

There have been previous hints on how to reset earlier versions of Mac OS X to delete users so that it boots to the Setup Assistant again. This can be useful if you are passing on or selling your computer to someone else. The most recent hint was posted in 2007 for Mac OS X 10.5 and there were significant corrections included in the comments. There is also a command that changed in 10.7 (also in the older hint’s comments) and even with the modifications suggested in the comments, the hint is still incomplete.

So instead of adding yet another modification in the comments of a hint related to 10.5, I thought I would submit a new hint brining everything together from the old hint, its comments, changes needed for 10.7, and the missing items I have found. This provides a current version of the hint for 10.7 and presumably 10.8 …


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