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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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Different format control characters in the format specifier

Format specifiers begin with a percentage character (%) and end with a format control character. It tells the printf statement how to output an item. The format control character decides what kind of value to print. The rest of the format specifier is made up of optional modifiers that control field width. The following are the format control characters used in format specifiers with printf in AWK:

  • %c: It prints a single character. If the argument is a number, then its corresponding ASCII character is printed. If a string is given as the argument, then only the first character of that string is printed. For example, if we give 65 to printf for printing, it outputs the letter A, which is the ASCII equivalent of 65:
$ awk 'BEGIN { printf "ASCII representation of 65 = character %c\n", 65 }'

The output...

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