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)

Redirecting Input and Output

If you want to save a program’s output for future reference, you can redirect it to a file. You can also redirect the input to a program from a file. Although input redirection may sound strange, some programs rely on this feature to enable them to process data, such as raw text files fed through a program that searches the text for patterns. In addition to redirecting output to files or input from files, you can pass one program’s output to another one as its input. A related technique involves the xargs command, which enables you to generate command-line options from files or other programs’ output.

Using Basic Redirection Operators


Redirection is achieved with the help of redirection operators, which are short strings that appear after the command and its arguments. Table 8.6

Standard Output This is for normal program messages.