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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 head

If you only want to view a certain number of lines from the beginning of a text file, use the head utility. To demonstrate, I’ll be showing you files that are here on my Fedora workstation. If you don’t have the same exact files on your own machine, feel free to use others.

By default, head displays the first ten lines of a file. I’ll show you in just a bit how to change that.

Let’s start by entering the /var/log/ directory, and looking at the first ten lines of the boot.log file, like this:

[donnie@fedora ~]$ cd /var/log
[donnie@fedora log]$ sudo head boot.log
[  OK  ] Finished logrotate.service - Rotate log files.
[FAILED] Failed to start vmware.ser… starts and stops VMware services.
See 'systemctl status vmware.service' for details.
         Starting vmware-USBArbitra…s and stops the USB Arbitrator....
[  OK  ] Started rsyslog.service - System Logging Service.
[  OK  ] Started chronyd.service...

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