файл группы пользователей  (user group file)
  
Имя (Name)
group - user group file
Описание (Description)
The /etc/group file is a text file that defines the groups on the
       system.  There is one entry per line, with the following format:
           group_name:password:GID:user_list
       The fields are as follows:
       group_name
              the name of the group.
       password
              the (encrypted) group password.  If this field is empty,
              no password is needed.
       GID    the numeric group ID.
       user_list
              a list of the usernames that are members of this group,
              separated by commas.
Файлы (Files)
/etc/group
Ошибки (баги) (Bugs)
As the 4.2BSD initgroups(3) man page says: no one seems to keep
       /etc/group up-to-date.
Смотри также (See also)
chgrp(1), gpasswd(1), groups(1), login(1), newgrp(1), sg(1),
       getgrent(3), getgrnam(3), gshadow(5), passwd(5), vigr(8)