Book Image

Linux Shell Scripting Bootcamp

By : James K Lewis
Book Image

Linux Shell Scripting Bootcamp

By: James K Lewis

Overview of this book

Linux Shell Scripting Bootcamp is all about learning the essentials of script creation, validating parameters, and checking for the existence of files and other items needed by the script. We will use scripts to explore iterative operations using loops and learn different types of loop statements, with their differences. Along with this, we will also create a numbered backup script for backup files. Further, you will get well-versed with how variables work on a Linux system and how they relate to scripts. You’ll also learn how to create and call subroutines in a script and create interactive scripts. The most important archive commands, zip and tar, are also discussed for performing backups. Later, you will dive deeper by understanding the use of wget and curl scripts and the use of checksum and file encryption in further chapters. Finally, you will learn how to debug scripts and scripting best practices that will enable you to write a great code every time! By the end of the book, you will be able to write shell scripts that can dig data from the web and process it efficiently.
Table of Contents (19 chapters)
Linux Shell Scripting Bootcamp
About the Author
About the Reviewer
Customer Feedback

Alerting the user

It's nice to have your computer beep when an important task has completed and you want to know about it right away. Here's a script I use to beep the internal speaker on my computer:

Chapter 10 – Script 3

# 5/3/2017
# beep the PC speaker

lsmod | grep pcspkr > /dev/null
if [ $rc -ne 0 ] ; then
 echo "Please modprobe pcspkr and try again."
 exit 255

echo -e '\a' > /dev/console

This command will beep the PC speaker if it has one and if the driver has been loaded. Note that this command will probably only work on your system when run as the root user.