Book Image

Learning AWK Programming

By : Shiwang Kalkhanda
5 (1)
Book Image

Learning AWK Programming

5 (1)
By: Shiwang Kalkhanda

Overview of this book

AWK is one of the most primitive and powerful utilities which exists in all Unix and Unix-like distributions. It is used as a command-line utility when performing a basic text-processing operation, and as programming language when dealing with complex text-processing and mining tasks. With this book, you will have the required expertise to practice advanced AWK programming in real-life examples. The book starts off with an introduction to AWK essentials. You will then be introduced to regular expressions, AWK variables and constants, arrays and AWK functions and more. The book then delves deeper into more complex tasks, such as printing formatted output in AWK, control flow statements, GNU's implementation of AWK covering the advanced features of GNU AWK, such as network communication, debugging, and inter-process communication in the GAWK programming language which is not easily possible with AWK. By the end of this book, the reader will have worked on the practical implementation of text processing and pattern matching using AWK to perform routine tasks.
Table of Contents (11 chapters)

GNU's Implementation of AWK – GAWK (GNU AWK)

This chapter covers the features of GNU AWK (GAWK) that are not available in primitive AWK. These features are not connected to each other, but are quite useful when used in the appropriate scenarios. Features such as reading non-decimal input, arbitrary precision arithmetic, array sorting, and some advance features such as network communication, debugging, and inter-process communication, are explained in this chapter using simple example programs. Some of these features are quite advanced, in the sense that their explanation requires a separate chapter devoted to them. However, we will discuss the main details of these features, so that we are able to use them when the situation arises. These features enhance the power of AWK and make it more productive.

In this chapter, we will cover the following :

  • Reading non-decimal...