(libc.info)User and Group IDs


User and Group IDs
==================

   Each user account on a computer system is identified by a "user
name" (or "login name") and "user ID".  Normally, each user name has a
unique user ID, but it is possible for several login names to have the
same user ID.  The user names and corresponding user IDs are stored in
a data base which you can access as described in Note: User Database.

   Users are classified in "groups".  Each user name belongs to one
"default group" and may also belong to any number of "supplementary
groups". Users who are members of the same group can share resources
(such as files) that are not accessible to users who are not a member
of that group.  Each group has a "group name" and "group ID".  Note:
Group Database, for how to find information about a group ID or group
name.


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