CLI AND SHELL
Command Line Interface (CLI)
Text based interface between the user and the operating system that accepts input in the form of typed command.
In simple terms, CLI stands for Command Line Interface. It's a way to communicate with your computer by typing text commands instead of using a mouse and clicking on icons. It's like talking to your computer using written instructions to get things done.
Shell
Contains the core portion of the operating system.
Imagine your computer as a helpful assistant. The "shell" is how you communicate with this assistant. When you tell the assistant what you want (like opening a program or organizing files), you're using the shell. It's a bit like giving simple instructions to get things done on your computer.
Kernel
The kernel is the central part of an operating system that manages the computer's resources, facilitates communication between software and hardware, and ensures overall system stability and security.
Think of the kernel as the "boss" or the "traffic cop" of the operating system. It makes sure everything runs smoothly, manages resources, and ensures that different parts of the computer can work together harmoniously.
Fundamentals
Bourne-again (Bash)
Bash is a specific type of shell. It's a command processor that typically runs in a text window where you type commands. Bash is one of many shells available for Unix-like operating systems, including Linux. Other examples of shells include sh (Bourne Shell), csh (C Shell), and zsh (Z Shell).
Bash serves as a powerful tool for users to interact with their operating system, execute commands, automate tasks, and customize their working environment through a text-based interface. It's a fundamental component of the Unix-like operating systems, including Linux.
Syntax
The proper way of structuring a command & any supporting information.
syntax refers to the set of rules that dictate how words, symbols, and commands must be arranged in a programming language or system to create valid and understandable instructions for a computer. It's like the grammar of a language, ensuring that code is correctly structured for proper execution. Adhering to the syntax rules is essential for writing error-free and functional code.
Man Page
man pages (short for manual pages) are built-in documentation in Unix-like operating systems that offer detailed explanations and instructions for using commands and system features.
Users can access these pages through the "man" command followed by the name of the command or topic they want information about. Man pages provide essential guidance on syntax, options, and usage, making them a valuable resource for understanding and using commands without needing to search online.
Example: "df" command.