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  • Book Overview & Buying Linux Essentials
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Linux Essentials

Linux Essentials - Second Edition

By : Christine Bresnahan, Richard Blum
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Linux Essentials

Linux Essentials

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)
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17
EULA

Setting Permissions

File ownership is meaningless without some way to specify what particular users can do with their own or other users’ files. That’s where permissions enter the picture. Linux’s permission structure is modeled after that of Unix, and it requires a bit of explanation before you tackle the issue. Once you understand the basics, you can begin modifying permissions, using either a GUI file manager or a text-mode shell. You can also set default permissions for new files that you create.

Understanding Permissions

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To understand Unix (and hence Linux) permissions, you may want to begin with the display created by the ls command, which lists the files in a directory, in conjunction with its -l option, which creates a long directory listing that includes files’ permissions. For instance, to see a long listing of the file test, you might type the following:

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Linux Essentials
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