group - user group file
file is a text file that defines the groups on the system.
There is one entry per line, with the following format:
The fields are as follows:
- the name of the group.
- the (encrypted) group password. If this field is empty, no
password is needed.
- the numeric group ID.
- a list of the usernames that are members of this group,
separated by commas.
As the 4.2BSD initgroups(3)
man page says: no one seems to keep
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