Primary Versus Secondary Groups
One final note on groups is that it is important to understand the difference between the primary and secondary group. A user can only be a member of one primary group. The primary group is the group that any files they create will belong to by default. However, a user can be a member of multiple secondary groups.
The primary group is the one that is listed in the /etc/passwd file along with the user's entry. Any other group that the user is a member of in /etc/group is considered to be a secondary group.
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