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Yes. The "id" command showed you your user name 3 times because it's showing you three different things, your user account, your current primary hroup, and the list of all groups you are in. Your user id is 501, which corresponds to "myusername". Your primary group is also 501 which is called "myusername" (in Mandrake as in Red Hat, the default is to make each user a member of a group of the same name), and that is the only group you are a member of.
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