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
Credits
About the Author
Acknowledgement
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface
Index

Using parameters


Okay, let's add some routines to this script to show how to use parameters with a subroutine. In order to make the output look better the cls routine is called first to clear the screen:

Chapter 4 - Script 5

#!/bin/sh
# 6/13/2017
# script5

# Subroutines
cls()
{
 tput clear
 return 0
}

home()
{
 tput cup 0 0
 return 0
}

end()
{
 let x=$COLUMNS-1
 tput cup $LINES $x
 echo -n "X"                 # no newline or else will scroll
}

bold()
{
 tput smso
}

unbold()
{
 tput rmso
}

underline()
{
 tput smul
}

normalline()
{
 tput rmul
}

move()                       # move cursor to row, col
{
 tput cup $1 $2
}

movestr()                    # move cursor to row, col
{
 tput cup $1 $2
 echo $3
}

# Code starts here
cls                          # clear the screen to make the output look better
rc=0                         # return code
if [ $# -ne 1 ] ; then
 echo "Usage: script5 parameter"
 echo "Where parameter can be: "
 echo " home      - put an X at the home position"
 echo...