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If I'm right, you can just run 'adduser' for an existing user to update the information about that user (the username/id must match). Note that any information that exists that you don't specify (again) is probably lost. For example if the user belonged to groups Group1 and Group2, and you re-ran adduser and told the user's groups were Group2 and Group3, the user might not belong to Group1 anymore. (note: it's been a long time since I last ran this command, and that group-"example" is just off the top of my head..)
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