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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

Leave a review - let other readers know what you think

Index

Creating a diff of two files and patching

In what case should you know what a diff is? Or a patch? In the Linux world, it is a way to determine the differences between files and also to solve problems at the OS level (especially if you have a broken driver in the Linux kernel). However, for the purposes of a cookbook, diffs and patches useful for a couple of main things:

When determining whether a particular script or configuration file has modifications
When plotting differences between versions, or migrating data between an old to new script, and so on

So, what is a diff or differential? A diff is the output that describes the differences between two files (file A and file B). The file A is the source, and the B file is the assumed to be modified file. If no diff output is created, then A and B are either empty or there are no differences. Diffs in a unified format typically look like this:

$ diff -urN fileA.txt fileB.txt 
--- fileA.txt 2017-12-11 15:06:49.972849620 -0500
+++ fileB.txt 2017...

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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.

See other products by Ron Brash

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

See other products by Ganesh Sanjiv Naik

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