Book Image

Bash Cookbook

By : Ron Brash, Ganesh Sanjiv Naik
Book Image

Bash Cookbook

By: Ron Brash, Ganesh Sanjiv Naik

Overview of this book

In Linux, one of the most commonly used and most powerful tools is the Bash shell. With its collection of engaging recipes, Bash Cookbook takes you through a series of exercises designed to teach you how to effectively use the Bash shell in order to create and execute your own scripts. The book starts by introducing you to the basics of using the Bash shell, also teaching you the fundamentals of generating any input from a command. With the help of a number of exercises, you will get to grips with the automation of daily tasks for sysadmins and power users. Once you have a hands-on understanding of the subject, you will move on to exploring more advanced projects that can solve real-world problems comprehensively on a Linux system. In addition to this, you will discover projects such as creating an application with a menu, beginning scripts on startup, parsing and displaying human-readable information, and executing remote commands with authentication using self-generated Secure Shell (SSH) keys. By the end of this book, you will have gained significant experience of solving real-world problems, from automating routine tasks to managing your systems and creating your own scripts.
Table of Contents (15 chapters)
Title Page
Copyright and Credits
Packt Upsell
Contributors
Preface
Index

Using Bash to monitor battery life and optimize it


In this recipe, we will learn about the TLP Linux tool. TLP is a command-line tool; it is used for power management and will optimize the battery life.

Getting ready

Besides having a Terminal open, you need to ensure that you have TLP installed on your system.

How to do it…

TLP’s configuration file is in the /etc/default/ directory and the filename is tlp. After installation, it starts as a service automatically. We can check whether it’s running under system by running the systemctl command, as follows:

$ sudo systemctl status tlp

Run the following command to get the operation mode:

$ sudo tlp start

To get the system information as well as TLP status, run the following command:

$ sudo tlp-stat -s

To view TLP configuration, run this command:

$ sudo tlp-stat -c

To get all the power configurations, run the given command:

$ sudo tlp-stat

To get the battery information, use this command:

$ sudo tlp-stat -b

To get the fan speed and temperature of the system...