Linux Installation and Usage tips

Linuxcentos start setting up a normal user, if you want to enter the root user, you can su
Then set the password, then enter SU again the second time, then enter the same password to go in.

There are many commands that need to be executed under root, but they are created with a normal account and password and do not know the root user's password.
Check on the Internet, just know:

The root password of Ubuntu is random by default, which is a new root password for each boot.
We can enter the command in the terminal sudo passwd, and then enter the current user's password, enter, the terminal will prompt us to enter a new password and confirm that the password at this time is the root of the new password.
After the successful modification, enter the command Su root, and then enter the new password is OK.
or modify the success, enter the command su, and then enter a new password is OK.

Ubuntu can be installed after the installation of SSH with RePET, and then the firewall can be executed to SSH remote connection

Linux Installation and Usage tips