Linux 2.6 - man page for group (linux section 5)
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GROUP(5) Linux Programmer's Manual GROUP(5)
group - user group file
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:
group_name the name of the group.
password the (encrypted) group password. If this field is empty, no password is
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 /etc/group up-to-date.
login(1), newgrp(1), getgrent(3), getgrnam(3), passwd(5)
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Linux 2010-10-21 GROUP(5)
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