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Linux Shell Scripting Bootcamp

Linux Shell Scripting Bootcamp

By : James K Lewis
3.5 (2)
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Linux Shell Scripting Bootcamp

Linux Shell Scripting Bootcamp

3.5 (2)
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 (12 chapters)
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11
Index

Using the for statement

Another way to loop is to use the for statement. It is commonly used when working with files and other lists. The general syntax of a for loop is as follows:

 for variable in list
 do
     some commands
 done

The list can be a collection of strings, or a filename wildcard, and so on. We can take a look at this in the example given in the next section.

Chapter 3 - Script 7

#!/bin/sh
#
# 5/4/2017
#
echo "script7 - Linux Scripting Book"

for i in jkl.c bob Linux "Hello there" 1 2 3
do
 echo -n "$i "
done

for i in script*             # returns the scripts in this directory
do
 echo $i
done

echo "End of script7"
exit 0

And the output on my system. This is my chap3 directory:

Chapter 3 - Script 7

The next script shows how the for statement can be used with files:

Chapter 3 - Script 8

#!/bin/sh
#
# 5/3/2017
#
echo "script8 - Linux Scripting Book"

if [ $# -eq 0 ] ; then
 echo "Please enter at least 1 parameter."
 exit 255
fi

for i in $...
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Linux Shell Scripting Bootcamp
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