The /etc/group file is a text file that defines the groups on the sys-
tem. There is one entry per line, with the following format:
The fields are as follows:
group_name the name of the group.
password the (encrypted) group password. If this field is empty, no
password is needed.
GID the numeric group ID.
user_list 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
login(1), newgrp(1), getgrent(3), getgrnam(3), passwd(5)
This page is part of release 3.35 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can
be found at http://man7.org/linux/man-pages/.
Linux 2010-10-21 GROUP(5)
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