Operating system

OS = Kernel + Shell

Kernel interacts with:

• CPU
• RAM
• Disk

Shell is used to access the kernel.

Types:

Shell
├── GUI
└── CLI
     └── Bash

Bash

Bash = Bourne Again Shell

Used in Unix-like systems:

• macOS
• Linux servers

Bash commands

List files:

ls

Change directory:

cd folderName

Examples: