coreutils: User information

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1 20 User information
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1 This section describes commands that print user-related information:
1 logins, groups, and so forth.
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Menu

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· id invocation               Print user identity.
· logname invocation          Print current login name.
· whoami invocation           Print effective user ID.
· groups invocation           Print group names a user is in.
· users invocation            Print login names of users currently logged in.
· who invocation              Print who is currently logged in.
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