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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 Regular Expressions

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Many Linux programs employ regular expressions, which are tools for expressing patterns in text. Regular expressions are similar in principle to the wildcards that can be used to specify multiple filenames, as described in Chapter 7, “Managing Files.” At their simplest, regular expressions can be plain text without adornment. Certain characters are used to denote patterns, though.

Two forms of regular expression are common: basic and extended. The form that you must use depends on the program. Some accept just one expression form, while others can use either type (depending on the options passed to the program). The differences between basic and extended regular expression forms can be complex and subtle, but the fundamental principles of both are similar.

The simplest type of regular expression is an alphabetic or alphanumeric string, such as HWaddr or...

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Linux Essentials
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