Book Image

Linux Essentials - Second Edition

By : Christine Bresnahan, Richard Blum
Book Image

Linux Essentials - Second Edition

By: Christine Bresnahan, Richard Blum

Overview of this book

Linux Essentials, Second Edition provides a solid foundation of knowledge for anyone considering a career in information technology, for anyone new to the Linux operating system, and for anyone who is preparing to sit for the Linux Essentials Exam. Through this engaging resource, you can access key information in a learning-by-doing style. Hands-on tutorials and end-of-chapter exercises and review questions lead you in both learning and applying new information—information that will help you achieve your goals! With the experience provided in this compelling reference, you can sit down for the Linux Essentials Exam with confidence. An open-source operating system, Linux is a UNIX-based platform that is freely updated by developers. The nature of its development means that Linux is a low-cost and secure alternative to other operating systems, and is used in many different IT environments. Passing the Linux Essentials Exam prepares you to apply your knowledge regarding this operating system within the workforce.
Table of Contents (19 chapters)
17
EULA

Working as root

Linux is modeled after Unix, which was designed as a multiuser OS. In principle, you can have thousands of accounts on a single Unix (or Linux) computer. One user, though, needs extraordinary power in order to manage the features of the computer as a whole. This is the root user, also known as the super user, superuser, or the administrator. Knowing why root exists, how to do things as root, and how to use root privileges safely is important for managing a Linux system.

Understanding User Types

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Most people use computers to do ordinary day-to-day computer tasks—browse the Web, write letters, manage a music collection, and so on. These activities are known collectively as user tasks, and they don’t require special privileges. As just noted, a Linux computer can have many user accounts, and the users can use the computer from these user accounts (also known as unprivileged accounts, unprivileged users, or standard users) to perform such user tasks.