See sibling reply. The uid is what defines the user, the name is just a convenient alias.
Not really. You can have separate users with separate $HOME, separate passwords, separate groups, separate everything.
User is user. Uid is uid. It's not the same. Uid is used for file permissions, that's true.
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Not really. You can have separate users with separate $HOME, separate passwords, separate groups, separate everything.
User is user. Uid is uid. It's not the same. Uid is used for file permissions, that's true.