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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

Using Arguments

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Variables can help you expand the utility of scripts. A variable is a placeholder in a script for a value that will be determined when the script runs. Variables’ values can be passed as parameters to a script, generated internally to a script, or extracted from a script’s environment. (An environment is a set of variables that any program can access. The environment includes things like the current directory and the search path for running programs.)

Variables that are passed to the script are frequently called parameters or arguments. They’re represented in the script by a dollar sign ($) followed by a number from 0 up—$0 stands for the name of the script, $1 is the first parameter to the script, $2 is the second parameter, and so on. To understand how this might be useful, consider the task of adding a user. As described in Chapter 13, “Creating Users and Groups,” creating an account for a new user typically involves running...

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Linux Essentials
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