名称

       groupmems - 用户主组的管理员成员

大纲

       groupmems -a user_name | -d user_name | [-g group_name] | -l | -p

描述

       The groupmems command allows a user to administer their own group membership list without
       the requirement of superuser privileges. The groupmems utility is for systems that
       configure its users to be in their own name sake primary group (i.e., guest / guest).

       Only the superuser, as administrator, can use groupmems to alter the memberships of other
       groups.

选项

       The options which apply to the groupmems command are:

       -a, --add user_name
           Add a user to the group membership list.

           If the /etc/gshadow file exist, and the group has no entry in the /etc/gshadow file, a
           new entry will be created.

       -d, --delete user_name
           从组成员列表中删除用户。

           If the /etc/gshadow file exist, the user will be removed from the list of members and
           administrators of the group.

           If the /etc/gshadow file exist, and the group has no entry in the /etc/gshadow file, a
           new entry will be created.

       -g, --group group_name
           超级用户可以指定修改哪个组的组成员列表。

       -h, --help
           现实帮助信息并退出。

       -l, --list
           列出组成员。

       -p, --purge
           从组成员列表中删除所有用户。

           If the /etc/gshadow file exist, and the group has no entry in the /etc/gshadow file, a
           new entry will be created.

       -R, --root CHROOT_DIR
           Apply changes in the CHROOT_DIR directory and use the configuration files from the
           CHROOT_DIR directory.

SETUP

       The groupmems executable should be in mode 2710 as user root and in group groups. The
       system administrator can add users to group groups to allow or disallow them using the
       groupmems utility to manage their own group membership list.

                $ groupadd -r groups
                $ chmod 2710 groupmems
                $ chown root.groups groupmems
                $ groupmems -g groups -a gk4

配置文件

       The following configuration variables in /etc/login.defs change the behavior of this tool:

       MAX_MEMBERS_PER_GROUP (number)
           Maximum members per group entry. When the maximum is reached, a new group entry (line)
           is started in /etc/group (with the same name, same password, and same GID).

           默认值是 0，意味着组中的成员数没有限制。

           此功能(分割组)允许限制组文件中的行长度。这对于确保 NIS 组的行比长于 1024 字符。

           如果要强制这个限制，可以使用 25。

           注意：分割组可能不受所有工具的支持(甚至在 Shadow 工具集中)。您不应该使用这个变量，除非
           真的需要。

文件

       /etc/group
           组账户信息。

       /etc/gshadow
           安全组账户信息

参见

       chfn(1), chsh(1), passwd(1), groupadd(8), groupdel(8), useradd(8), userdel(8), usermod(8).