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Learning AWK Programming

You're reading from   Learning AWK Programming A fast, and simple cutting-edge utility for text-processing on the Unix-like environment

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Product type Paperback
Published in Mar 2018
Publisher Packt
ISBN-13 9781788391030
Length 416 pages
Edition 1st Edition
Languages
Tools
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Author (1):
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Shiwang Kalkhanda Shiwang Kalkhanda
Author Profile Icon Shiwang Kalkhanda
Shiwang Kalkhanda
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Table of Contents (11) Chapters Close

Preface 1. Getting Started with AWK Programming FREE CHAPTER 2. Working with Regular Expressions 3. AWK Variables and Constants 4. Working with Arrays in AWK 5. Printing Output in AWK 6. AWK Expressions 7. AWK Control Flow Statements 8. AWK Functions 9. GNU's Implementation of AWK – GAWK (GNU AWK) 10. Practical Implementation of AWK

One-dimensional arrays

The AWK language provides one-dimensional arrays for storing strings and numbers. An array name could be any valid variable name. One variable name cannot be used as both an array and a variable at the same time in the same program.

Arrays in AWK are extremely powerful in comparison to traditional arrays that we use in other programming languages. Arrays in AWK are associative—that is, each array is a collection of a pair: an index and its corresponding array element value. In associative arrays, indexes are not essentially required to be in order, one can use either a string or a number as an array index. An array size can expand or shrink at runtime and is not statically defined.

Its syntax is as follows:

arr[index] = value

The different elements of the array syntax used here are explained in the following list:

  • arr: This is the name of the array...
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