Arch manual pages

GROUPMOD(8) 系统管理命令 GROUPMOD(8)

groupmod - modify a group definition on the system

groupmod [选项] GROUP

The groupmod command modifies the definition of the specified GROUP by modifying the appropriate entry in the group database.

groupmod 命令可以接受的选项有:

-g, --gid GID

The group ID of the given GROUP will be changed to GID.

The value of GID must be a non-negative decimal integer. This value must be unique, unless the -o option is used.

Users who use the group as primary group will be updated to keep the group as their primary group.

Any files that have the old group ID and must continue to belong to GROUP, must have their group ID changed manually.

No checks will be performed with regard to the GID_MIN, GID_MAX, SYS_GID_MIN, or SYS_GID_MAX from /etc/login.defs.

-h, --help

现实帮助信息并退出。

-n, --new-name NEW_GROUP

The name of the group will be changed from GROUP to NEW_GROUP name.

-o, --non-unique

When used with the -g option, allow to change the group GID to a non-unique value.

-p, --password PASSWORD

已经加密过的密码,就像 crypt(3) 返回的那样。

注意:不推荐使用这个选项,因为密码(或加密过的密码)会被用户通过列出这个过程而看到。

您应该确保密码符合系统的密码政策。

-R, --root CHROOT_DIR

Apply changes in the CHROOT_DIR directory and use the configuration files from the CHROOT_DIR directory.

-P, --prefix PREFIX_DIR

Apply changes in the PREFIX_DIR directory and use the configuration files from the PREFIX_DIR directory. This option does not chroot and is intended for preparing a cross-compilation target. Some limitations: NIS and LDAP users/groups are not verified. PAM authentication is using the host files. No SELINUX support.

在 /etc/login.defs 中有如下配置变量,可以用来更改此工具的行为:

MAX_MEMBERS_PER_GROUP (number)

每个组条目的最大成员数。达到最大值时,在 /etc/group 开始一个新条目(行)(使用同样的名称,同样的密码,同样的 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。

/etc/group
组账户信息。

/etc/gshadow

安全组账户信息。

/etc/login.defs

Shadow 密码套件配置。

/etc/passwd

用户账户信息。

groupmod 命令可以返回如下值:

0

E_SUCCESS: success

2

E_USAGE: invalid command syntax

3

E_BAD_ARG: invalid argument to option

4

E_GID_IN_USE: specified group doesn't exist

6

E_NOTFOUND: specified group doesn't exist

9

E_NAME_IN_USE: group name already in use

10

E_GRP_UPDATE: can't update group file

11

E_CLEANUP_SERVICE: can't setup cleanup service

12

E_PAM_USERNAME: can't determine your username for use with pam

13

E_PAM_ERROR: pam returned an error, see syslog facility id groupmod for the PAM error message

chfn(1), chsh(1), passwd(1), gpasswd(8), groupadd(8), groupdel(8), login.defs(5), useradd(8), userdel(8), usermod(8).
2019-07-31 shadow-utils 4.7