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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

Debugging Shell Scripts

If you’ve ever written a beautiful looking script, only to be disappointed when it doesn’t work properly, don’t feel alone. This happens to all of us, and even happened to me a few times when I was creating scripts for this book. (I know, shocking, right?)

The debugging process should begin the moment that you begin to design your code. Put careful thought into the design, test each portion as you write it, and—for goodness’ sake—use a text editor with color-coded syntax highlighting. (That color highlighting will prevent you from making a multitude of typographical errors.)

Topics in the chapter include:

  • Understanding common scripting errors
  • Not Enough Quoting
  • Creating a Wild Loop
  • Using shell script debugging tools and techniques
  • Using echo Statements
  • Using xtrace for Debugging
  • Checking for Undefined Variables
  • Checking for Errors with the -e Option
  • ...

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