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(3), crypt(3), passwd(1), passwd(5)

BUGS
The passwd(1) command won’t change the passwords.