Introduction to Linux Command shells

Linux is an operating system, like macOS or Windows. It is also the most popular Open Source and free, as in freedom, operating system. It powers the vast majority of the servers that compose the Internet. It's the base upon which everything is built, not just that, Android is based on a modified version of Linux.

The Linux "core" (called the kernel) was born in 1991 in Finland, and it went a really long way from its humble beginnings. It went on to be the kernel of the GNU Operating System, creating the duo GNU/Linux.

In this chapter, we will take a look at what Linux Shell is and take a look at useful Linux Commands:

A Linux shell is a command-line interface for interacting with the operating system. 

It allows users to execute commands, manipulate files, and run scripts by typing commands into the terminal.

The shell acts as an intermediary between the user and the operating system's kernel, allowing users to interact with the system in a more human-readable way. The shell takes user commands as input, interprets them, and passes them to the kernel for execution.

There are several different shells available for Linux, including the Bourne shell (sh), the C shell (csh), the Korn shell (ksh), and the most widely used, the Bourne Again shell (bash).

In bash, the user can navigate the file system, execute programs, manage processes, and automate tasks using commands and scripting. Bash provides various built-in commands, as well as the ability to execute external commands and scripts.

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