GROUP(5) Linux Programmer's Manual GROUP(5)
group - user group file
/etc/group is an ASCII file which defines the groups to which users
belong. There is one entry per line, and each line has the format:
The field descriptions are:
the name of the group.
the (encrypted) group password. If this field is empty, no
password is needed.
GID the numerical group ID.
all the group member's user names, separated by commas.
As the 4.2BSD initgroups(3) man page says: No-one seems to keep
login(1), newgrp(1), passwd(5)
Linux 1992-12-29 GROUP(5)