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

GROUP(5)							File Formats Manual							  GROUP(5)

group - group file
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.
setgroups(2), initgroups(3X), crypt(3), passwd(1), passwd(5)
The passwd(1) command won't change the passwords. 7th Edition May 15, 1985 GROUP(5)