1. user 用户与 root 用户切换

strong@foreverstrong:~$ 
strong@foreverstrong:~$ sudo su
[sudo] password for strong: 
root@foreverstrong:/home/strong# 
root@foreverstrong:/home/strong# 
root@foreverstrong:/home/strong# exit
exit
strong@foreverstrong:~$ 
strong@foreverstrong:~$

2. root 用户与 user 用户切换

其中 strong 是系统的一个帐户名。

strong@foreverstrong:~$ 
strong@foreverstrong:~$ sudo su
root@foreverstrong:/home/strong# 
root@foreverstrong:/home/strong# su - strong
strong@foreverstrong:~$ 

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References

[1] Yongqiang Cheng, https://yongqiang.blog.csdn.net/