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

Clearing the screen

The tput clear terminal command can be used to clear the current command-line session. You could type tput clear all the time, but wouldn't just cls be nicer?

Here's a simple script that clears the current screen:

Chapter 4 - Script 1

# 5/8/2017
tput clear

Notice that this was so simple I didn't even bother to include a Usage message or return code. Remember, to make this a command on your system do this:

  • cd $HOME/bin

  • create/edit a file named cls

  • copy and paste the preceding code into this file

  • save the file

  • run chmod 755 cls

You can now type cls from any terminal (under that user) and your screen will clear. Try it.