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gpasswd − administer /etc/group and /etc/gshadow
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gpasswd [选 项 ] group |
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.
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.
−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 。
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.
The following configuration variables in /etc/login.defs change the behavior of this tool:
/etc/group 组 账 户 信 息 。
/etc/gshadow 安 全 组 账 户 信 息 。
newgrp(1), groupadd(8), groupdel(8), groupmod(8), grpck(8), group(5), gshadow(5).