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)

Identifying Running Processes

Before you can manage processes, you must be able to identify them. The ps and top utilities can help you identify processes. In either case, you can search for processes in various ways, such as by name or by resource use. You may also want to identify how much memory your processes are consuming, which you can do with the free command.

Using ps to Identify Processes


The simplest tool for identifying processes is ps, which produces a process listing. Listing 9.1 shows an example of ps in action. In this example, the -u option restricts output to processes owned by the specified user (rich), while—forest creates a display that shows parent/child relationships.