ADMCHG：如果设置了这个标志，那么当用户下一次登录时，会提示用户修改密码。
ADMCHG: when set, the user will be prompted to change their password when next logging in.
当然，如果你发现一个你不认识的机器登录到你的账号，那这时就可以修改你的密码。
Of course, if you see a connection from a machine that you don't recognize, it's time to change your password.
如果用户的密码已经过期，它提示用户修改密码，在成功地修改密码之后，允许用户登录。
If the password is expired for the user, it prompts the user to change the password and then allows the user to log in once the password is successfully changed.
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