The /etc/group 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:
As the 4.2BSD initgroups(3) man page says: no one seems to keep
chgrp(1), gpasswd(1), groups(1), login(1),
newgrp(1), sg(1), getgrent(3), getgrnam(3),
gshadow(5), passwd(5), vigr(8)
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- the name of the group.
- the (encrypted) group password. If this field is empty, no password is
- the numeric group ID.
- a list of the usernames that are members of this group, separated by