If I create a non-root user and I change it UID = 0. The system also have root user. Does it mean that the system is going to give root permission to this user? If not, are there any security problems by doing this?
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UID==0 is the definition for the all-powerful root user. If you create a userid with UID==0 it will be the root user, no matter what you call it. They are many, many security problems associated with multiple root accounts. Tracability, for one.
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What if I create two users with UID=0? Are they both root automatically? – drdot Feb 14 '17 at 22:32