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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

Using tac

tac--cat spelled backwards--displays one or more files at a time in reverse order. To see how it works, we’ll first create two text files that will look like this:

[donnie@fedora ~]$ cat > testfile_1.txt
one
two
three
four
five
six
[donnie@fedora ~]$ cat > testfile_2.txt
seven
eight
nine
ten
eleven
twelve
[donnie@fedora ~]$

Let’s use cat to view both of the files at once:

[donnie@fedora ~]$ cat testfile_1.txt testfile_2.txt
one
two
three
four
five
six
seven
eight
nine
ten
eleven
twelve
[donnie@fedora ~]$

You can use tac to view one file in reverse order:

[donnie@fedora ~]$ tac testfile_1.txt
six
five
four
three
two
one
[donnie@fedora ~]$

Or, view two or more files in reverse order:

[donnie@fedora ~]$ tac testfile_1.txt testfile_2.txt
six
five
four
three
two
one
twelve
eleven
ten
nine
eight
seven
[donnie@fedora ~]$

Note that the contents of the first file is displayed first, followed by the contents of the second file...

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