Definition: user private group (UPG): Group assigned to a user account in which that user exclusively belongs; useful for managing file permissions for individual users.
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Source: Redhat-9-Glossary / Linux Dictionary V 0.16
http://www.tldp.org/LDP/Linux-Dictionary/html/index.html
Author: Binh Nguyen linuxfilesystem(at)yahoo(dot)com(dot)au
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