Book Image

Linux for System Administrators

By : Viorel Rudareanu, Daniil Baturin
Book Image

Linux for System Administrators

By: Viorel Rudareanu, Daniil Baturin

Overview of this book

Linux system administration is an essential aspect of maintaining and managing Linux servers within an organization. The role of a Linux system administrator is pivotal in ensuring the smooth functioning and security of these servers, making it a critical job function for any company that relies on Linux infrastructure. This book is a comprehensive guide designed to help you build a solid foundation in Linux system administration. It takes you from the fundamentals of Linux to more advanced topics, encompassing key areas such as Linux system installation, managing user accounts and filesystems, networking fundamentals, and Linux security techniques. Additionally, the book delves into the automation of applications and infrastructure using Chef, enabling you to streamline and optimize your operations. For both newcomers getting started with Linux and professionals looking to enhance their skills, this book is an invaluable hands-on guide with a structured approach and concise explanations that make it an effective resource for quickly acquiring and reinforcing Linux system administration skills. With the help of this Linux book, you’ll be able to navigate the world of Linux administration confidently to meet the demands of your role.
Table of Contents (21 chapters)
Part 1: Linux Basics
Part 2: Configuring and Modifying Linux Systems
Part 3: Linux as a Part of a Larger System

What is a shell?

Computer software known as a shell makes an operating system’s services accessible to users or other programs.

A shell is a program that receives commands and sends them to the operating system for processing, to put it simply. In an interactive session, the user has the option of typing commands from the keyboard, or they can be written in a shell script that can be reused. On a Unix-type system such as Linux in the past, it was the sole user interface (UI) accessible. Today, in addition to command-line interfaces (CLIs) such as shells, we also have graphical UIs (GUIs).

The fundamental capability of shells is the ability to launch command-line programs that are already installed on the system. They also offer built-ins and scripting control structures such as conditionals and loops. Each shell has its own way of doing that. Some shells still support the Bourne shell, one of the original shells that was created for an early Unix system by a programmer...