Linux Bash command-line basic operations

Shell

Shell We called shell, we know that the operating system is the bottom of a kernel kernel, the kernel is used to implement all the upper-level services, all the upper command, the upper application needs some basic functions, such as network connection, network communication, such as keyboard driver, mouse driver, for example, our system scheduling, Memory management, etc., is done by the kernel of the operating system. But kernel we have no way to direct control, this time we need the shell to complete, the shell is the user's instructions to pass to kernel, translated into kernel can understand some of the information, so we can say that through the shell to control the operating system.

Command structure

Commands are generally divided into three parts: command option parameters

Running in the background

Any command + space +&, indicating the command to run in the background

History

Use history to view historical commands

CTRL + Z

Ctrl+r Smart Search History command (very useful)

Su

User Switching: Su-username

Sudo

Execute a command with the administrator sudo + command

passwd

Modify Current user password: passwd

CTRL + Z

Suspend program: CTRL + Z

Bg

Let the process run in the background: bg+ process number

Fg

Let the process run in the foreground: fg+ process number

Linux Bash command-line basic operations