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The Ultimate Linux Shell Scripting Guide

The Ultimate Linux Shell Scripting Guide

By : Donald A. Tevault
4.8 (5)
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The Ultimate Linux Shell Scripting Guide

The Ultimate Linux Shell Scripting Guide

4.8 (5)
By: Donald A. Tevault

Overview of this book

Embark on a comprehensive journey through command shells with this hands-on manual. While Bash is a Linux staple, Z shell and PowerShell are rising stars, applicable to Linux, macOS, and Unix. Progress seamlessly through chapters, each building on the last, creating a solid foundation. Learn through a unique approach: concepts, examples, and interactive labs. These labs, nearly a hundred strong, form the core of experiential learning, essential for script creation. Focusing on Linux commands and their scripting applications, this manual is universally relevant across Linux and select Unix-like systems. It goes beyond theory, offering practical scripts for real-world Linux administration. Scripts are designed for manageability, aiding learning and troubleshooting. The goal is to nurture the ability to craft intelligent, functional shell scripts. While centered on Bash, this book offers a peek into the future with Z Shell and PowerShell, expanding your skills and adaptability. This book is systematically structured and engaging so that it will guide you to master command shells, equipping you for real-world Linux challenges.
Table of Contents (26 chapters)
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24
Other Books You May Enjoy
25
Index

Working with Multi-Line Records

So far, we’ve been using awk to parse text files in which each line is its own distinct record. Sometimes though, you might have to work with files that have each record spread across several lines. For example, look at this inventory.txt file:

Kitchen spatula
$4.99
Housewares
Raincoat
$36.99
Clothing
On Sale!
Claw hammer
$7.99
Tools

The first and third records each consist of three lines, and the second record consists of four lines. Each record is separated by a blank space. Now, let’s say that we need to import this information into a spreadsheet. That won’t work well with multi-line records, so we’ll need to find an easy way to convert it into a spreadsheet-friendly format. Once again, awk to the rescue! Here’s the inventory.awk script that helps us out:

#!/usr/bin/awk -f
BEGIN {
        FS="\n"
        RS=""
        ORS=""
}
{
        count=1
        while (count<NF...

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