The awk utility interprets a special-purpose programming language that makes it possible to handle simple data-reformatting jobs with just a few lines of code.

The Gawk Reference Guide provides beginners with a simple introduction to the basics, and experts will find advanced details they need.

In this you will see the following things below.

Part I: The awk Language
1 Getting Started with awk
2 Running awk and gawk
3 Regular Expressions
4 Reading Input Files
5 Printing Output
6 Expressions
7 Patterns, Actions, and Variables
8 Arrays in awk
9 Functions
Part II: Problem Solving with awk
10 A Library of awk Functions
11 Practical awk Programs
Part III: Moving Beyond Standard awk with gawk
12 Advanced Features of gawk
13 Internationalization with gawk
14 Debugging awk Programs
15 Arithmetic and Arbitrary-Precision Arithmetic with gawk
16 Writing Extensions for gawk
Part IV: Appendices
Appendix A The Evolution of the awk Language
Appendix B Installing gawk
Appendix C Implementation Notes
Appendix D Basic Programming Concepts

You will find all this section offline without any internet connection and lean DB easily anywhere and anytime.