SUDO command - How to remove a User using Terminal?

So I just inherited from my coworker's MacBook Pro. I then decided to transfer all of my files and realized that the root folder was still on his name. I changed the User's name in "System Preferences" but that did not change the root folder's name. I then went to Terminal and tried to change the folder's name using the "mv OldFoldersName NewFoldersName" and the prompt said Permission denied. I then used "sudo mv OldFoldersName NewFoldersName". After restarting my computer, all the files were gone and I landed on a "LION first time USE" type of Desktop. All my files are gone and terminal shows me two users' names under /Users/ => OldUser and NewUser.
What can I do to recover my old files? What can I do to repair my Mistake and only have one User?
Thank you very much for your help.

10Kg wrote:
All my files are gone and terminal shows me two users' names under /Users/ => OldUser and NewUser.
What can I do to recover my old files?
If your adapt at using Terminal, why don't you hook up a blank external drive, command s boot into Single user root mode,
ls /Users
then cd to that directory or mv it to the external drive?
Any why are you messing with Terminal and on your only copy of your files?
Kind of risky right?
Nearly everything on a Mac has been figured out and a safe GUI ability to allow users to do things, there is no need to risk the dangers of the Terminal and unknown under workings.
But now you have to revert to your backup and start all over like John said.
Read here for more options
https://discussions.apple.com/docs/DOC-3046
https://discussions.apple.com/docs/DOC-3045

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