GROUP(5)

NAME
group - user group file

DESCRIPTION
/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:

    group_name:passwd:GID:user_list

The field descriptions are:

group_name
    the name of the group.

password
    the (encrypted) group password. If this field is empty, no password is needed.

GID the numerical group ID.

user_list
    all the group member's user names, separated by commas.

BUGS
As the 4.2BSD initgroups(3) man page says: Noone seems to keep /etc/group up-to-date.

FILES
/etc/group

SEE ALSO
login(1), newgrp(1), passwd(5)