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Linux Shell Scripting Bootcamp

You're reading from Linux Shell Scripting Bootcamp The fastest way to learn Linux shell scripting

Product type Paperback

Published in Jul 2017

Publisher Packt

ISBN-13 9781787281103

Length 208 pages

Edition 1st Edition

Tools

Linux

Concepts

Shell Scripting

Author (1):

James K Lewis

View More author details

Table of Contents (12) Chapters

Preface

1. Getting Started with Shell Scripting FREE CHAPTER

2. Working with Variables

3. Using Loops and the sleep Command

4. Creating and Calling Subroutines

5. Creating Interactive Scripts

6. Automating Tasks with Scripts

7. Working with Files

8. Working with wget and curl

9. Debugging Scripts

10. Scripting Best Practices

Index

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

#!/bin/sh
#
# 5/3/2017
#
# beep the PC speaker

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

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.

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Authors (1)

James K Lewis

James K Lewis

James Kent Lewis has been in the computer industry for over 35 years. He started out writing BASIC programs in high school and used punch cards in college for his Pascal, Fortran, COBOL, and assembly language classes. He himself learned the C programming language by writing various utilities, including a fully-functional text editor, which he uses everyday. He started out using DOS and AIX, and then OS/2. Linux is now his operating system of choice. Jim has worked in the past for several companies, including IBM, Texas Instruments, Tandem, Raytheon, Hewlett-Packard, and others. Most of these positions dealt with low-level device drivers and operating system internals. In his spare time he likes to create video games in Java.He has written articles for IBM Developer Works and has one patent.

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