名称¶

chpasswd - 批量更新密码

大纲¶

chpasswd [选项]

描述¶

The chpasswd command reads a list of user name and password pairs from standard input and uses this information to update a group of existing users. Each line is of the format:

user_name:password

By default the passwords must be supplied in clear-text, and are encrypted by chpasswd. Also the password age will be updated, if present.

By default, passwords are encrypted by PAM, but (even if not recommended) you can select a different encryption method with the -e, -m, or -c options.

Except when PAM is used to encrypt the passwords, chpasswd first updates all the passwords in memory, and then commits all the changes to disk if no errors occurred for any user.

When PAM is used to encrypt the passwords (and update the passwords in the system database) then if a password cannot be updated chpasswd continues updating the passwords of the next users, and will return an error code on exit.

此命令一般用于需要一次创建很多用户的大型系统。

选项¶

The options which apply to the chpasswd command are:

-c, --crypt-method METHOD

-e, --encrypted

-h, --help

-m, --md5

-R, --root CHROOT_DIR

-s, --sha-rounds ROUNDS

CAVEATS¶

记住要设置权限或者掩码来阻止其它用户对未加密文件的读取。

配置文件¶

The following configuration variables in /etc/login.defs change the behavior of this tool:

文件¶

/etc/passwd

/etc/shadow

/etc/login.defs

/etc/pam.d/chpasswd

参见¶

passwd(1), newusers(8), login.defs(5), useradd(8).