1. su command - switch user
1.1. Switch to root user (password required)
su - root
1.2. Switch to another user, such as jackma (no password required)
su - jackma
2. sudo command - add root permissions to ordinary users
2.1. Usage
Switch to the root user and execute the visudo command, which will automatically enter the vim compiler.
su - root
enter password
visudo
Add the following command to the last line
Add permissions for ordinary users, then:wq to save
Switch to normal user
are - jackma
Create a directory in the root directory with insufficient permissions
Use sudo command
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2.2. Summary
You can give a common command with root privileges, the syntax is:
sudo other commands
You need to execute the visudo command as the root user, and add configurations to allow ordinary users to have sudo command execution permissions.