passwd命令限制用户密码到期时间

1.passwd命令

[root@rhel7 skel]# passwd  -n  -w  -x  rusky
Adjusting aging data for user rusky.
passwd: Success 

说明：
-n : a minimal usage period of  days ---3天后用户才能修改密码
-x : an expiry after  days   ----5天后密码自动过期
-w : a warning is generated  days before expiry  ---离密码过期时间2天内提示用户

2.chage -l命令

Showing Password Expiry Information with  chage -l

[root@rhel7 skel]# chage -l rusky
Last password change                                    : Jun ,
Password expires                                        : Jun ,  --密码过期时间
Password inactive                                       : never
Account expires                                         : never
Minimum number of days between password change          :
Maximum number of days between password change          :
Number of days of warning before password expires       : 

如果时间小于（Minimum number of days between password change : 3），则不允许修改密码。

[rusky@rhel7 ~]$ passwd
Changing password for user rusky.
Changing password for rusky.
(current) UNIX password:
You must wait longer to change your password
passwd: Authentication token manipulation error
[rusky@rhel7 ~]$ 

[lxj@rhel7 ~]$ su - rusky
Password:
Warning: your password will expire in  day  --提示密码1天后到期
Last login: Mon Jun  :: EDT  on pts/