User Private Group
Some systems diverge from the traditional POSIX-model of users and groups, by creating a new group – a "user private group" – for each user. The "user private group" scheme can be preferred for a variety of reasons including using a umask of 002 and not having every "user" able to write to newly created files. In this case however, no other users must be added to the "user private group" or they will have write-permission on all files.
Read more about this topic: Filesystem Permissions
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