给用户授权以root身份执行ls,touch,passwd命令，但是禁止修改root用户密码

通过visudo修改授权oldboy相关的权限

通过visudo修改授权oldboy相关的权限
[root@lin ~]# visudo
oldboy  ALL=(ALL)       /bin/ls, /bin/touch, /usr/bin/passwd, !/usr/bin/passwd root

登录oldboy，并试验结果

登录oldboy，并试验结果
[root@lin ~]# su - oldboy
[oldboy@lin ~]$ sudo passwd lin666
Changing password for user lin666.
New password: 
BAD PASSWORD: it is too simplistic/systematic
BAD PASSWORD: is too simple
Retype new password: 
passwd: all authentication tokens updated successfully.
[oldboy@lin ~]$ sudo passwd root
[sudo] password for oldboy: 
Sorry, user oldboy is not allowed to execute '/usr/bin/passwd root' as root on lin.