这是用户的用户名。

It can be the name of a new user or the name of an existing user (or a user created before by newusers). In case of an existing user, the user's information will be changed, otherwise a new user will be created.

此字段将被加密然后用于加密后密码的新值。

此字段用于定义用户的 UID。

If the field is empty, a new (unused) UID will be defined automatically by newusers.

如果此字段包含一个数字，此数字会用于 UID。

If this field contains the name of an existing user (or the name of a user created before by newusers), the UID of the specified user will be used.

如果一个现有用户更改了 UID，此用户的文件所有权需要手动修复。

此字段用于定义用户的主组 ID。

If this field contains the name of an existing group (or a group created before by newusers), the GID of this group will be used as the primary group ID for the user.

如果此字段是一个数字，此数字会被用作此用户的主组 ID。如果没有对应此 GID 的现有组，将会使用此 GID 创建一个新组，名称和用户名相同。

If this field is empty, a new group will be created with the name of the user and a GID will be automatically defined by newusers to be used as the primary group ID for the user and as the GID for the new group.

If this field contains the name of a group which does not exist (and was not created before by newusers), a new group will be created with the specified name and a GID will be automatically defined by newusers to be used as the primary group ID for the user and GID for the new group.

此字段复制到用户的 GECOS 字段。

此字段用于定义用户的主目录。

If this field does not specify an existing directory, the specified directory is created, with ownership set to the user being created or updated and its primary group. Note that newusers does not create parent directories of the new user's home directory. The newusers command will fail to create the home directory if the parent directories do not exist, and will send a message to stderr informing the user of the failure. The newusers command will not halt or return a failure to the calling shell if it fails to create the home directory, it will continue to process the batch of new users specified.

If the home directory of an existing user is changed, newusers does not move or copy the content of the old directory to the new location. This should be done manually.

此字段定义了用户的 shell。对此字段不进行任何检查。

Allow names that do not conform to standards.

使用指定的方法加密密码。

可用的方法有 DES, MD5, NONE, and SHA256 或 SHA512，前提是您的 libc 支持这写方法。

显示帮助信息并退出。

创建一个系统账户。

System users will be created with no aging information in /etc/shadow, and their numeric identifiers are chosen in the SYS_UID_MIN-SYS_UID_MAX range, defined in login.defs, instead of UID_MIN-UID_MAX (and their GID counterparts for the creation of groups).

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

使用指定次数的轮转来加密密码。

值 0 表示让系统为加密方法选择默认的轮转次数 (5000)。

会强制最小 1,000，最大 9,9999,9999

您只可以对 SHA256 或 SHA512 使用此选项。

By default, the number of rounds is defined by the SHA_CRYPT_MIN_ROUNDS and SHA_CRYPT_MAX_ROUNDS variables in /etc/login.defs.

用户账户信息。

安全用户账户信息。

组账户信息。

安全组账户信息。

Shadow 密码套件配置。

Per user subordinate group IDs.

Per user subordinate user IDs.