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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 join

Here’s another handy utility you can use to combine two text files. (Unlike the other utilities we’ve looked at, you can use join for two text files, but no more than two.) To see how it works, take a look at the following diagram with its text files about famous Hollywood actors from a by-gone era. Then, go ahead and create the files, with tabs between the two columns of each file. Then, run the command that’s shown in the diagram.

Figure 6.6: Joining two files together with join

As you see, the join utility replaces the tabs that were between the columns with blank spaces.

Note that in each of the two input files, the first field is the same. (In this case, it’s the last name of each actor.) In the output, the first field--which we’ll call the key field--is only listed once. The information for each actor’s last name--the key field--is obtained from both of the two input files.

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