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)
2
Part I: The Linux Command Line
13
Part II: Shell Scripting Basics
20
Part III: Advanced Shell Scripting
28
Part IV: Creating Practical Scripts
32
End User License Agreement

The Red Hat–Based Systems

Like the Debian-based distributions, the Red Hat–based systems have several different front-end tools that are available. These are the common ones:

  • yum: Used in Red Hat and Fedora
  • urpm: Used in Mandriva
  • zypper: Used in openSUSE

These front-ends are all based on the rpm command line tool. The following section discusses how to manage software packages using these various rpm-based tools. The focus is on yum, but information is also included for zypper and urpm.

Listing installed packages

To find out what is currently installed on your system, at the shell prompt, type the following command:

yum list installed

The information will probably whiz by you on the display screen, so it's best to redirect the installed software listing into a file. You can then use the more or less command (or a GUI editor) to look at the list in a controlled manner.

yum list installed > installed_software

To list out the installed packages on your openSUSE or...