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)

Working with Arrays in AWK

An array is a variable that is used to store a set of values (strings or numbers). These values, or independent elements, are accessed by their index in the array. Indexes are stored in square brackets and may be either numbers or strings. This chapter focuses on how arrays are implemented in AWK.

In this chapter, we will cover the following topics:

  • One-dimensional arrays in AWK
  • Assigning and accessing elements in arrays
  • Referring to array elements
  • Processing arrays using loops
  • Creating an array using a split function
  • Delete operations in arrays
  • Multidimensional array implementation in AWK