Linux普通用户切换省略输入用户名密码

今天没事&＃xff0c;做了个小实验&＃xff0c;普通用户切换如何省略密码
1、省略密码验证很简单&＃xff0c;只需把/etc/passwd中的root:x:0:0:root:/root:/bin/bash&＃xff0c;改为root::0:0:root:/root:/bin/bash&＃xff0c;就可以了&＃xff0c;就是去掉了里面的x&＃xff0c;这样root用户就不用密码了。其他用户也一样。
[root&＃64;localhost ~]# useradd user01
[root&＃64;localhost ~]# passwd user01
Changing password for user user01.
New UNIX password:
BAD PASSWORD: it is based on a dictionary word
Retype new UNIX password:
passwd: all authentication tokens updated successfully.
[root&＃64;localhost ~]# useradd user02
[root&＃64;localhost ~]# passwd user02
Changing password for user user02.
New UNIX password:
BAD PASSWORD: it is based on a dictionary word
Retype new UNIX password:
passwd: all authentication tokens updated successfully.
创建完用户名密码后&＃xff0c;现在切换下用户
[root&＃64;localhost ~]# su - user01
[user01&＃64;localhost ~]$ whoami
user01
[user01&＃64;localhost ~]$ su - user02
口令&＃xff1a;
[user02&＃64;localhost ~]$
输入用户口令后&＃xff0c;才能切换
[user02&＃64;localhost ~]$ su -
口令&＃xff1a;
[root&＃64;localhost ~]#
[root&＃64;localhost ~]# vim /etc/passwd
将x去掉
user01:x:502:502::/home/user01:/bin/bash
user02:x:503:503::/home/user02:/bin/bash
修改为如下格式
user01::502:502::/home/user01:/bin/bash
user02::503:503::/home/user02:/bin/bash
保存后再进行切换实验&＃xff0c;
[root&＃64;localhost ~]# su - user01
[user01&＃64;localhost ~]$ whoami
user01
[user01&＃64;localhost ~]$ su - user02
[user02&＃64;localhost ~]$ whoami
user02
[user02&＃64;localhost ~]$
现在可以实现无密码切换用户