Clean Install With Custom User Id

Hello
From experience I am aware of problems in our network when we have 2 users with accounts which have the same User Id. For this reason I have always tried to ensure each User on our network has a unique User Id.
I am upgrading several User's iMacs to Mountain Lion and I will format their drives and perform a clean install. Is it possible, using Terminal, to perform a clean install but specify a custom User Id?
Many thanks.
Chris

It would probably be easier to change your Apple ID password. This would allow you to continue downloading past iTunes/App Store purchases.
Apple ID - Manage
Do you have a backup? If not, backup before doing anything because an erase and reinstall will cause you to lose all your data.
If your MacBook came with Mountain Lion pre-installed, you would have to purchase a copy from the App Store, but you can probably avoid that.
Boot to the Recovery Volume (command - R on a restart) or hold down the option key during a restart and select Recovery Volume. Run Disk Utility Verify/Repair and Repair Permissions. Then select the Erase tab. Format is Mac OS Extended (Journaled). Erase and then reinstall the OS.
OS X Recovery
When you reboot, use Setup Assistant to restore your data.

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