Linux系统普通用户切换省略输入用户名密码

今天没事，做了个小实验，普通用户切换如何省略密码1、省略密码验证 很简单，只需把/etc/passwd中的root:x:0:0:root:/root:/bin/bash，改为root::0:0:root:/root:/bin/bash，就可以了，就是去掉了里面的x，这样root用户就不用密码了。其他用户也一样。[root@localhost ~]# useradd   user01[root@localhost ~]# passwd   user01Changing password for user user01.New UNIX password: BAD PASSWORD: it is based on a dictionary wordRetype new UNIX password: passwd: all authentication tokens updated successfully.[root@localhost ~]# useradd   user02 [root@localhost ~]# passwd  user02Changing password for user user02.New UNIX password: BAD PASSWORD: it is based on a dictionary wordRetype new UNIX password: passwd: all authentication tokens updated successfully.创建完用户名密码后，现在切换下用户[root@localhost ~]# su - user01[user01@localhost ~]$ whoami user01[user01@localhost ~]$ su - user02口令：[user02@localhost ~]$ 输入用户口令后，才能切换[user02@localhost ~]$ su - 口令：[root@localhost ~]# [root@localhost ~]# vim /etc/passwd将x去掉user01:x:502:502::/home/user01:/bin/bashuser02:x:503:503::/home/user02:/bin/bash修改为如下格式user01::502:502::/home/user01:/bin/bashuser02::503:503::/home/user02:/bin/bash保存后再进行切换实验，[root@localhost ~]# su - user01[user01@localhost ~]$ whoami user01[user01@localhost ~]$ su - user02[user02@localhost ~]$ whoami user02[user02@localhost ~]$ 现在可以实现无密码切换用户