Section: Linux Programmer's Manual (5)
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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
man page says: No-one seems to keep
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