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Linux is one of the most dominant and adaptable operating systems globally. Linux operating system is utilized in many areas of Computer Science, ranging from embedded to smart devices. This Operating system is utilized in High-Performance Computers, servers that are running the global Internet infrastructure services like DNS, smartphones, android tablets, and televisions.

The Linux Operating System is distributed with intuitive and modern graphical user interfaces, which are customized to the distribution of Linux in use ranging from GNOME to KDE to Cinnamon. On any Linux computer, the shell is the most powerful and pliant way of interacting with the operating system kernel and attendant services. A Linux shell is used to execute individual commands. Commands are a set of instructions sent to the Linux kernel to tell the computer what to do. The Linux shell can also execute and interpret commands from a written text file called a bash script, which enables easy automation of tasks.

Many System administration tasks are routine and repetitive that need to be automated for example, automatically like sending alerts, e-mails, and performing routine maintenance. This book contains beginner information about the Linux command line, shell and bash scripting. The book introduces the novice Linux user to basic Linux scripting skills to automate and perform a number of Systems Administration tasks. The System Administration tasks in Linux range from parsing and interpreting text, to networking services operation automation. The Linux shell is only as powerful as the user intends it to be. Linux experts feel the power of shell scripting since they use the shell to do large automation. Linux Command Line gives you these magical capabilities!

Linux operating system can be accessed by users through the Graphical User Interface, also known as the GUI and through the command-line interface, also known as the CLI.Command-line interface also referred to as the terminal or console, is Linux's text-based interface into which you enter commands, which are basically instructions to your Computer. Commands are made up of options and arguments. These commands are read and interpreted by the command-line interface. If you are accessing your Computer using the GNOME or KDE graphical user interface, the command line interface is accessed by opening a terminal. When a user accesses the text-based login into the computer, the command line interface will be presented as the BASH shell.

The shell has an eminent function in a Linux system that is to run commands. The Linux shell is simply a program that reads user commands entered from the keyboard and passes them to the kernel for execution or processing. The shell can actually be considered as a full programming language that has functions and variables, and data structures such as arrays. The shell is directly connected to the kernel, and thus it has native File Input and Output primitives built into its syntax. The shell has a native process and job control function in a Linux operating system.

The shell enables interactive access to the Linux kernel and programs running on it. The shell executes and functions as a regular program, and it initializes or starts whenever a user logs in to a console. A shell is a macro processor that interprets and executes user instructions to the system through commands entered through the keyboard. The Linux bash shell is touted as both a command-line interpreter and a traditional programming language.

The shell offers the user interface a collection of GNU utilities as a command interpreter. It is possible to create files that contain lines of commands as code, and these files become commands themselves. These newly written commands known as shell scripts kept in directories such as /bin have the same status as system commands, enabling system administrators to create custom environments to automate their routine tasks. Linux shells are used interactively ornon-interactively depending on the method used to make them. Shell recognizes keyboard-typed input in the interactive mode. Shells also read commands from a file called bash script when executing non-interactively. You can also visit websites using shells, such as the Free UK Business Directory.

The shell is available to you in any of the many Linux distributions available. The shell enables us to write commands and package them as executable script files to run shell and all user programs, work with Linux file systems, compile computer program code, and administer the system. The shell gives many Linux experts much more power to control how a system operates and function. It is through the shell that users can customize and automate their Linux infrastructure.

A shell enables both synchronous and asynchronous execution of bash commands. The shell waits for concurrent commands to finish before accepting more input; while reading and executing extra commands, asynchronous commands continue to perform in conjunction with the shell. The constructs of redirection allow fine-grained control of these commands' input and output. In addition, the shell enables contents of command settings to be controlled. Shells also provide a small set of built-in commands that can't or can't get functionality via distinct services.