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Consider this situation.

A user called _example is created without assigning him to any group.

A new group is manually added to /etc/group called _example without any users.

Is the _example user automatically part of _example group now or does he still need to be explicitly added to the group?

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up vote 3 down vote accepted

No. Unless the user's group is set to _example (in the password file) or the user is explicitly added to the _example group in /etc/group, the user is not a member of that group.

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Users must be explicitly added to any group. It is common convention to have a group for named the same as each user. The operable theory is that other users may be added to a particular user's group in an adhoc fashion allowing the user to control which files are exposed to that group.

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