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Linux Command Line and Shell Scripting Techniques

You're reading from Linux Command Line and Shell Scripting Techniques Master practical aspects of the Linux command line and then use it as a part of the shell scripting process

Product type Paperback

Published in Mar 2022

Publisher Packt

ISBN-13 9781800205192

Length 552 pages

Edition 1st Edition

Tools

Linux

Concepts

Shell Scripting

Authors (2):

Jasmin Redzepagic

Vedran Dakic

View More author details

Table of Contents (19) Chapters

Preface

1. Chapter 1: Basics of Shell and Text Terminal

2. Chapter 2: Using Text Editors FREE CHAPTER

3. Chapter 3: Using Commands and Services for Process Management

4. Chapter 4: Using Shell to Configure and Troubleshoot a Network

5. Chapter 5: Using Commands for File, Directory, and Service Management

6. Chapter 6: Shell-Based Software Management

7. Chapter 7: Network-Based File Synchronization

8. Chapter 8: Using the Command Line to Find, Extract, and Manipulate Text Content

9. Chapter 9: An Introduction to Shell Scripting

10. Chapter 10: Using Loops

11. Chapter 11: Working with Variables

12. Chapter 12: Using Arguments and Functions

13. Chapter 13: Using Arrays

14. Chapter 14: Interacting with Shell Scripts

15. Chapter 15: Troubleshooting Shell Scripts

16. Chapter 16: Shell Script Examples for Server Management, Network Configuration, and Backups

17. Chapter 17: Advanced Shell Script Examples

18. Other Books You May Enjoy

Managing process priorities

When we were explaining how to work with the top command, we intentionally omitted some details to give them their own time and place to discuss them later on in this chapter. We'll discuss one of these details here: the difference between the PR and NI fields in the top output. Let's do that now.

Getting ready

Keep the cli1 virtual machine powered on and let's continue using our shell.

How to do it…

We are going to learn how to use the top, nice, and renice commands to manage process scheduling in accordance with our wishes. First, let's use the top command. Let's renice a running process to a more negative value and a more positive value. Let's use the following top output for that:

Figure 3.20 – Starting point – processes started by the student user

Let's now change the priority of the process with PID 47160 (top). Press the R key and the top output will change...

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Authors (2)

Vedran Dakic

Vedran Dakic

Vedran Dakic is a master of electrical engineering and computing and an IT trainer, covering system administration, cloud, automatization, and orchestration courses. He is a certified Red Hat, VMware, and Microsoft trainer. He's currently employed as head of the department of operating systems at Algebra University College in Zagreb. As part of this job, he's a lecturer for 3- and 5-year study programs in system engineering, programming, and multimedia tracks. Also, he does a lot of consulting and systems integration for his clients' projects – something he has been doing for the past 25 years. His approach is simple – bring real-world experience to all the courses that he teaches as it brings added value to his students and customers.

See other products by Vedran Dakic

Jasmin Redzepagic

Jasmin Redzepagic

Jasmin Redzepagic is a professional master in computer engineering, with a sub-specialization in system engineering, but is a person with many hats worn over the years. Having worked in IT as long as he has, he has been a sound technician, SysOps, DevOps, hardware tester, editor-in-chief of a major magazine, writer, IT support lead, and head of IT at a couple of companies. He is currently employed by Algebra University College in Zagreb. This enables him to have a very wide overview of different technologies while still maintaining his focus – implementing and teaching the implementation of open source technologies in the field. Right now, his main interest is trying to teach his students and clients to understand the immense expanse of tools available for any conceivable task, with his goal being to get people to understand computers as something that is the most formidable tool we, as humanity, have ever had.

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