gpasswd

名称

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

大纲

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 -d, --delete user -h, --help -Q, --root CHROOT_DIR -r, --remove-password -R, --restrict -A, --administrators user,... -M, --members user,...

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 /etc/gshadow

参见

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