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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

Understanding Path Security

The possibility—however remote it may be—exists that someone could plant a trojaned version of some system utility on your system, and then manipulate a user’s PATH setting so that the trojaned utility would be invoked, instead of the real one. The trojaned utility could do a variety of nasty things, such as exfiltrating sensitive data or performing a ransomware attack by encrypting important files. Before I show you a script, let’s see how this looks on the command-line. Let’s begin by showing you where the executable file for the normal ls command is located:

donnie@fedora-server:~$ which ls
alias ls='ls --color=auto'
    /usr/bin/ls
donnie@fedora-server:~$

We see that it’s located in the /usr/bin/ directory, as it should be. Now, let’s create a bogus ls, in the form of a script, and place it into the /tmp/ directory. Here’s the ls script:

#!/bin/bash
echo "This is a trojaned...

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