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Bash Cookbook

You're reading from Bash Cookbook

Product type Book

Published in Jul 2018

Publisher Packt

ISBN-13 9781788629362

Pages 264 pages

Edition 1st Edition

Languages

Concepts

Workflow Automation

Authors (2):

Ron Brash

Ganesh Sanjiv Naik

View More author details

Table of Contents (15) Chapters

Title Page

Copyright and Credits

Packt Upsell

Contributors

Preface

1. Crash Course in Bash

2. Acting Like a Typewriter and File Explorer

3. Understanding and Gaining File System Mastery

4. Making a Script Behave Like a Daemon

5. Scripts for System Administration Tasks

6. Scripts for Power Users

7. Writing Bash to Win and Profit

8. Advanced Scripting Techniques

1. Other Books You May Enjoy

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Index

Keeping programs/scripts running after logoff

Leading up to getting our scripts to run as daemons, we need to know how to keep commands running after a user logs off (or better yet, have them started by the system itself (we will look at this in more detail later). When a user logs in, a session for that user is created, but when they log off—unless the system owns it, processes and scripts typically get killed or closed.

This recipe is about keeping your scripts and activities running in the background after you log off.

Getting ready

Besides having a terminal open, we need to remember a few concepts:

When a user logs off, any apps or processes owned by the current user will exit (the shell will send a signal)
The shell is configurable to not send a shutdown signal to processes
Applications and scripts use stdin and stdout for the usual operations
Applications or scripts in the background can be referred to as jobs

The purpose of this chapter is to not show you process management, but how we can...

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Authors (2)

Ron Brash

Ron Brash is the CTO and co-founder of a successful technology consultancy company that provides services in a multitude of domains, but primarily in FOSS and Linux. For over 7 years, he has worked on embedded systems, which provide security and network connectivity in industrial control systems and SCADA networks, all running an optimized embedded Linux. He participates regularly at FOSS and community events, providing feedback and mini-seminars where appropriate. He loves to share his knowledge.

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Ganesh Sanjiv Naik

Ganesh Sanjiv Naik is an author, consultant, and corporate trainer for embedded Android, embedded Linux, and Internet of Things related product development. He completed his computer engineering in 1988. Since then, he has worked in this industry. He has worked on projects including micro-controller based projects to advanced Embedded Android projects. He has more than 20 years of professional experience and project accomplishment in information technology. Ganesh has a passion and deep desire for teaching. He has trained 1,000 engineers in Linux and Android product development. He has developed a lot of training material as well as curriculum for various universities and training institutes. He has an interest in spiritual study and practices such as meditation. He is a certified yoga teacher. His hobbies include yoga and martial arts. He has worked as a corporate trainer for Indian Space Research Organization, Intel, GE, Samsung, Motorola, Penang Skill Development Center (Malaysia), various companies in Singapore as well as various other corporates in India and other countries. He has started a company called Levana Technologies, which works with the Penang Skill Development Center (Malaysia) for consulting and training activities. If you would like to send feedback, suggestions, or corrections in the book, he can be contacted at https://in.linkedin.com/in/naikganesh. This book is his real-life experience…. He has worked as a consultant and corporate trainer in the following skills: • Internet of Things • Embedded Android, Android internals, and device driver development • USB and PCI device driver development in Linux • Embedded Linux and device driver development • Unix Shell scripting with sed and awk • Embedded C++ and C programming • Operating systems, software engineering, and networking • Problem solving—analysis, reasoning, and solution techniques for software engineers

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