Book Image

Linux Command Line and Shell Scripting Bible - Third Edition

By : Richard Blum, Christine Bresnahan
Book Image

Linux Command Line and Shell Scripting Bible - Third Edition

By: Richard Blum, Christine Bresnahan

Overview of this book

The Linux command line enables you to type specific shell commands directly into the system to manipulate files and query system resources. Command line statements can be combined into short programs called shell scripts, a practice increasing in popularity due to its usefulness in automation. Linux is a robust system with tremendous potential, and Linux Command Line and Shell Scripting Bible opens the door to new possibilities. Linux Command Line and Shell Scripting Bible is your essential Linux guide. It contains new functional examples that are fully updated to align with the latest Linux features. Beginning with command line fundamentals, the book moves into shell scripting and shows you the practical application of commands in automating frequently performed functions. This book is a complete guide providing detailed instruction and expert advice working within this aspect of Linux. Whether used as a tutorial or as a quick reference, this book contains information that every Linux user should know.
Table of Contents (34 chapters)
Part I: The Linux Command Line
Part II: Shell Scripting Basics
Part III: Advanced Shell Scripting
Part IV: Creating Practical Scripts
End User License Agreement

Package Management Primer

Before diving into the world of Linux software package management, this chapter goes through a few of the basics first. Each of the major Linux distributions utilizes some form of a Package Management System (PMS) to control installing software applications and libraries. A PMS utilizes a database that keeps track of these items:

  • What software packages are installed on the Linux system
  • What files have been installed for each package
  • Versions of each of the software packages installed

Software packages are stored on servers, called repositories, and are accessed across the Internet via PMS utilities running on your local Linux system. You can use the PMS utilities to search for new software packages or even updates to software packages already installed on the system.

A software package often has dependencies or other packages that must be installed first for the software to run properly. The PMS utilities detect these dependencies and offer to install any additionally...