How to switch commands between Linux superuser and ordinary user?

The default login is normal user permissions
Display $ symbol

tree@ubuntu:/usr$

Switch super user permissions from normal users:

sudo su

tree@ubuntu:/usr$ sudo su

Enter the password

[sudo] password for tree:

After entering the password, you can switch to the super user.

Switching from super user to ordinary user:
su username

root@ubuntu:/usr# su tree

There is no need to enter a password to switch from super user to ordinary user. Enter the above command. Then press Enter directly

tree@ubuntu:/usr$

This will switch back to a normal user.

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