What is an Linux Operating System?

Linux is a free and open-source operating system based on the Linux kernel, an operating system first released on September 17, 1991, by Linus Torvalds. It is a platform-independent which means supports almost all major hardware like X86, ARM, and SPARC 

Terminal, Command, Shell, and Kernel

Terminal is a type of interface to interact with shell session which provides a display for output and a keyboard for input

Command-line is a text-based interface which instructs to the computer with predefined programs
Shell is a command-line interpreter that can be used to interact with the kernel. It invokes the system calls based on the user input command

Kernel is the heart of the operating system. It manages various hardware resources in the system like CPU, Memory, Disk, Display, Serialport, Network and Different types of  I/O, etc..

The layer of Shell with respect to OS


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