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BSD 2.11 - man page for group (bsd section 5)

GROUP(5)							File Formats Manual							  GROUP(5)

NAME
group - group file
DESCRIPTION
Group contains for each group the following information: group name encrypted password numerical group ID a comma separated list of all users allowed in the group This is an ASCII file. The fields are separated by colons; Each group is separated from the next by a new-line. If the password field is null, no password is demanded. This file resides in directory /etc. Because of the encrypted passwords, it can and does have general read permission and can be used, for example, to map numerical group ID's to names.
FILES
/etc/group
SEE ALSO
setgroups(2), initgroups(3X), crypt(3), passwd(1), passwd(5)
BUGS
The passwd(1) command won't change the passwords. 7th Edition May 15, 1985 GROUP(5)