passwd

passwd(password)命令可让用户修改帐户的密码。一般来说，设置帐户密码失败有几种情况：密码太简单、密码太短、密码中的字符多数相同。例如：

[root@teacher root]$ passwd

Changing password for user zjz.

Changing password for zjz

(current) UNIX password:

New password:

BAD PASSWORD:it’s WAY too short

New password:

BAD PASSWORD:is too simple

New password:

BAD PASSWORD:it does not contain enough DIFFERENT characters

Retype new password:

passwd: all authentication tokens updated successfully.

出自陈纯.Red Hat Linux 9 网络服务入门与进阶