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According to IDC, over 170,000 new servers were shipped in the first quarter of 2003. That also means that there were potentially more than 170,000 people like you charged with administering these systems without the proper knowledge or training to do so. Linux Shell Scripting with Bash will help you learn to not only get your system up and running quickly by employing the Bash shell, but it will also show you professional scripting solutions through the use of structured programming and standard Linux development tools. The book focuses on the Linux environment, which the shell relies on to function, and the robust Linux tool set, making this book ideal for learning shell scripting. Real-world scripts are included that are readable, extendable and easy to debug. This book is an asset to any Linux user.

Learn all the command lines for all Linux shells in this one-stop guide

There's a lot to be said for going back to basics. Not only does this Bible give you a quick refresher on the structure of open-source Linux software, it also shows you how to bypass the hefty graphical user interface on Linux systems and start interacting the fast and efficient way—with command lines and automated scripts. You'll learn how to manage files on the filesystem, start and stop programs, use databases, even do Web programming—without a GUI—with this one-stop resource.

• Understand the Linux desktop and various command-line parameters
• Learn filesystem navigation, file handling, and the basics of bash shell commands
• Write shell scripts to automate routine functions and reports
• Harness nesting loops and structured commands
• Monitor programs, master file permissions, and make queries
• Run scripts in background mode and schedule jobs
• Use sed, gawk, and regular expressions
• Explore all alternate shells, including ash, tcsh, ksh, korn, and zsh

FreeBSD and OpenBSD are increasingly gaining traction in educational institutions, non-profits, and corporations worldwide because they provide significant security advantages over Linux. Although a lot can be said for the robustness, clean organization, and stability of the BSD operating systems, security is one of the main reasons system administrators use these two platforms.

There are plenty of books to help you get a FreeBSD or OpenBSD system off the ground, and all of them touch on security to some extent, usually dedicating a chapter to the subject. But, as security is commonly named as the key concern for today's system administrators, a single chapter on the subject can't provide the depth of information you need to keep your systems secure.

FreeBSD and OpenBSD are rife with security "building blocks" that you can put to use, and Mastering FreeBSD and OpenBSD Security shows you how. Both operating systems have kernel options and filesystem features that go well beyond traditional Unix permissions and controls. This power and flexibility is valuable, but the colossal range of possibilities need to be tackled one step at a time. This book walks you through the installation of a hardened operating system, the installation and configuration of critical services, and ongoing maintenance of your FreeBSD and OpenBSD systems.

Using an application-specific approach that builds on your existing knowledge, the book provides sound technical information on FreeBSD and Open-BSD security with plenty of real-world examples to help you configure and deploy a secure system. By imparting a solid technical foundation as well as practical know-how, it enables administrators to push their server's security to the next level. Even administrators in other environments--like Linux and Solaris--can find useful paradigms to emulate.

Written by security professionals with two decades of operating system experience, Mastering FreeBSD and OpenBSD Security features broad and deep explanations of how how to secure your most critical systems. Where other books on BSD systems help you achieve functionality, this book will help you more thoroughly secure your deployments.

Wouldn’t you like to automate the tedious daily tasks of system administration? Automating UNIX and Linux Administration will show you how, by exploring existing tools and offering real-world examples. Parts of the book are Linux-specific, but most of it applies to a UNIX system, including multiple variants of UNIX. Author Kirk Bauer briefly overviews tools and technologies—and assumes preliminary knowledge about editing a configuration file or mounting a file system.

The techniques, methods, and tools in this book will help you manage a single system—but will prove especially powerful across multiple systems. No matter if the systems are desktops, servers, or Beowulf clusters—all of them will benefit from this automation. And managing five to five thousand systems will become a simpler task!

This book covers bash, the GNU Bourne Again Shell, which is a member of the Bourne family of shells that includes the original Bourne shell sh, the Korn shell ksh, and the Public Domain Korn Shell pdksh. While these and other shells such as dash, and zsh are not specifically covered, odds are that most of the scripts will work pretty well with them.
You should be able to read this book cover to cover, and also just pick it up and read anything that catches your eye. But perhaps most importantly, we hope that when you have a question about how to do something or you need a hint, you will be able to easily find the right answer—or something close enough—and save time and effort.
A great part of the Unix philosophy is to build simple tools that do one thing well, then combine them as needed. This combination of tools is often accomplished via a shell script because these commands, called pipelines, can be long or difficult to remember and type. Where appropriate, we’ll cover the use of many of these tools in the context of the shell script as the glue that holds the pieces together to achieve the goal.