GPASSWD(1)

名称
gpasswd - administer /etc/group and /etc/gshadow

大纲

gpasswd [option] group

描述

The gpasswd command is used to administer /etc/group, and /etc/gshadow. Every group can have administrators, members and a password.

System administrators can use the -A option to define group administrator(s) and the -M option to define members. They have all rights of group administrators and members.

gpasswd called by a group administrator with a group name only prompts for the new password of the group.

If a password is set the members can still use newgrp(1) without a password, and non-members must supply the password.

  请注意组密码

Group passwords are an inherent security problem since more than one person is permitted to know the password. However, groups are a useful tool for permitting co-operation between different users.

选项

Except for the -A and -M options, the options cannot be combined.

The options which apply to the gpasswd command are:

-a, --add user
    Add the user to the named group.

-d, --delete user
    Remove the user from the named group.

-h, --help
    显示帮助信息并退出。

-Q, --root CHROOT_DIR
    Apply changes in the CHROOT_DIR directory and use the configuration files from the CHROOT_DIR directory. Only absolute paths are supported.

-r, --remove-password
    Remove the password from the named group. The group password will be empty. Only group members will be allowed to use newgrp to join the named group.

-R, --restrict
    Restrict the access to the named group. The group password is set to "!". Only group members with a password will be allowed to use newgrp to join the named group.

-A, --administrators user,...
    设置有管理权限的用户列表。

-M, --members user,...
    设置组成员列表。

CAVEATS

This tool only operates on the /etc/group and /etc/gshadow files. Thus you cannot change any NIS or LDAP group. This must be performed on the corresponding server.

配置文件

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

文件

/etc/group
    组账户信息。

/etc/gshadow
    安全组账户信息。

参见

newgrp(1), groupadd(8), groupdel(8), groupmod(8), grpck(8), group(5), gshadow(5).