1.passwd命令
[root@rhel7 skel]# passwd -n 3 -w 2 -x 5 ruskyAdjusting aging data for user rusky.passwd: Success 说明：20160617 -n 3: a minimal usage period of 3 days ---3天后用户才能修改密码-x 5: an expiry after 5 days ----5天后密码自动过期-w 2: a warning is generated 2 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 ruskyLast password change : Jun 17, 2016Password expires : Jun 22, 2016 --密码过期时间Password inactive : neverAccount expires : neverMinimum number of days between password change : 3Maximum number of days between password change : 5Number of days of warning before password expires : 2
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 passwordpasswd: Authentication token manipulation error[rusky@rhel7 ~]$ [lxj@rhel7 ~]$ su - ruskyPassword: Warning: your password will expire in 1 day --提示密码1天后到期Last login: Mon Jun 20 22:16:31 EDT 2016 on pts/0
