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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
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Index

Testing Scripts for POSIX Compliance

It’s always important to test your shell scripts before putting them into production. This becomes even more important when you create scripts that need to run on a wide variety of operating systems and shells. In this section, we’ll look at a few ways to perform that testing.

Creating Scripts on a POSIX-compliant Shell

When you first start creating your scripts, you might want to use an interpreter shell that’s completely POSIX-compliant. Be aware though, that some POSIX-compliant shells still allow you to use certain bashisms. That’s because POSIX defines a minimum standard that an operating system or shell must meet, and doesn’t prohibit adding extensions. For example, sh on FreeBSD allows these two bashisms:

  • Using echo -e for output.
  • Using == for text string comparisons.

Now, I haven’t extensively tested sh on FreeBSD to see exactly how many bashisms it allows. But...

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