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Learning AWK Programming

Learning AWK Programming

By : Kalkhanda
5 (4)
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Learning AWK Programming

Learning AWK Programming

5 (4)
By: 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)
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Relational expressions

Relational expressions are built using relational operators, also known as conditional or comparison operators. These operators are used to test conditions, like if or while. Relational expressions compare strings or numbers for relationships such as equality, greater than , less than, and so on.

These expressions return 1 if the condition evaluates to true and 0 if false. When comparing operands of different types, numeric operands are converted to strings using a built-in variable (using CONVFMT). Strings are compared character to character.

Equal to (==):

This relational operator is represented by the equals symbol repeated twice (==). It returns true if both operands are equal; otherwise it returns false. Here, we have to make sure not to mistype the == operator by forgetting to put one = character. In this case, the AWK code still remains valid but...

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