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名 称

groupadd - 创 建 一 个 新 组

大 纲

groupadd [选 项 ] group

描 述

The groupadd command creates a new group account using the values specified on the command line plus the default values from the system. The new group will be entered into the system files as needed.

选 项

The options which apply to the groupadd command are:

-f, --force

This option causes the command to simply exit with success status if the specified group already exists. When used with -g, and the specified GID already exists, another (unique) GID is chosen (i.e. -g is turned off).

-g, --gid GID

The numerical value of the group's ID. This value must be unique, unless the -o option is used. The value must be non-negative. The default is to use the smallest ID value greater than or equal to GID_MIN and greater than every other group.

See also the -r option and the GID_MAX description.

-h, --help 现 实 帮 助 信 息 并 退 出 。

-K, --key KEY=VALUE

Overrides /etc/login.defs defaults (GID_MIN, GID_MAX and others). Multiple -K options can be specified.

Example: -K GID_MIN=100  -K GID_MAX=499

Note: -K GID_MIN=10,GID_MAX=499 doesn't work yet.

-o, --non-unique 此 选 项 允 许 添 加 一 个 使 用 非 唯 一 GID 的 组 。

-p, --password PASSWORD

The encrypted password, as returned by crypt(3). The default is to disable the password.

Note: This option is not recommended because the password (or encrypted password) will be visible by users listing the processes. 您 应 该 确 保 密 码 符 合 系 统 的 密 码 政 策 。

-r, --system 创 建 一 个 系 统 组 。

The numeric identifiers of new system groups are chosen in the SYS_GID_MIN-SYS_GID_MAX range, defined in login.defs, instead of GID_MIN-GID_MAX.

-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.

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 。

/etc/login.defs

Shadow 密 码 套 件 配 置 。

CAVEATS

It is usually recommended to only use groupnames that begin with a lower case letter or an underscore, followed by lower case letters, digits, underscores, or dashes. They can end with a dollar sign. In regular expression terms: [a-z_][a-z0-9_-]*[$]?

On Debian, the only constraints are that groupnames must neither start with a dash ('-') nor plus ('+') nor tilde ('~') nor contain a colon (':'), a comma (','), or a whitespace (space:' ', end of line: '\n', tabulation: '\t', etc.).

Groupnames may only be up to 32 characters long.

You may not add a NIS or LDAP group. This must be performed on the corresponding server.

If the groupname already exists in an external group database such as NIS or LDAP, groupadd will deny the group creation request.

退 出 值

The groupadd command exits with the following values:

0

success

2

invalid command syntax

3

invalid argument to option

4

GID not unique (when -o not used)

9

group name not unique

10

can't update group file

参 见

chfn(1), chsh(1), passwd(1), gpasswd(8), groupdel(8), groupmod(8), login.defs(5), useradd(8), userdel(8), usermod(8).

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