Book Image

Linux Shell Scripting Cookbook, Second Edition - Second Edition

Book Image

Linux Shell Scripting Cookbook, Second Edition - Second Edition

Overview of this book

The shell remains one of the most powerful tools on a computer system — yet a large number of users are unaware of how much one can accomplish with it. Using a combination of simple commands, we will see how to solve complex problems in day to day computer usage.Linux Shell Scripting Cookbook, Second Edition will take you through useful real-world recipes designed to make your daily life easy when working with the shell. The book shows the reader how to effectively use the shell to accomplish complex tasks with ease.The book discusses basics of using the shell, general commands and proceeds to show the reader how to use them to perform complex tasks with ease.Starting with the basics of the shell, we will learn simple commands with their usages allowing us to perform operations on files of different kind. The book then proceeds to explain text processing, web interaction and concludes with backups, monitoring and other sysadmin tasks.Linux Shell Scripting Cookbook, Second Edition serves as an excellent guide to solving day to day problems using the shell and few powerful commands together to create solutions.
Table of Contents (16 chapters)
Linux Shell Scripting Cookbook
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Index

Gathering information about processes


Processes are the running instance of a program. Several processes run on a computer, and each process is assigned a unique identification number called a process ID (PID). Multiple instances of the same program with the same name can be executed at the same time, but they all will have different PIDs. A process consists of several attributes, such as which user owns the process, the amount of memory used by the program, CPU time used by the program, and so on. This recipe shows how to gather information about processes.

Getting ready

Important commands related to process management are top, ps, and pgrep. Let's see how we can gather information about processes.

How to do it...

ps is an important tool for gathering information about the processes. It provides information on which user owns the process, the time when a process started, the command path used for executing the process, PID, the terminal it is attached with (TTY), the memory used by the process...