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This section describes commands that print user-related information: logins, groups, and so forth.
id: Print real and effective uid and gid
Print real and effective uid and gid. 20.2
logname: Print current login name
Print current login name. 20.3
whoami: Print effective user id
Print effective user id. 20.4
groups: Print group names a user is in
Print group names a user is in. 20.5
users: Print login names of users currently logged in
Print login names of users currently logged in. 20.6
who: Print who is currently logged in
Print who is currently logged in.
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