While quite possible, the question remains, why? There already is a quite useful little widget called "adduser" that probably comes with most unix systems. It's quite effective.
If you want to do it manually, I THINK this would suffice:

• Create the user home directory: Copy /etc/skel to /home/username
• Add the user entry to /etc/passwd and /etc/passwd- (if using shadow passwords)
• Dito for the users group: /etc/group and /etc/group-

I think that would be enough. Then again, I am not quite sure.

Odie

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