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(sh-utils.info)User information

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

id invocation

Print real and effective uid and gid.

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.