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The concept of a group is a collection of users. If you belong
to a certain group, and a set of files give you special group
permissions, you inherit those permissions. For example, if you're
a member of group staff, and the following file has permissions:
-rw-r----- 1 tot staff 2437 Sep 8 18:12 foo
You may read the file `foo'. On most systems you can issue the
command groups and it will list all groups to which you belong.
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