Linux in a Nutshell , now in its fourth edition, has won awards in the Linux community as the most indispensable book about Linux. It is an essential desktop reference for the commands that users of Linux utilize every day, with the depth of information and the practical, succinct "In a Nutshell" format that made the previous editions so popular. Comprehensive but concise, Linux in a Nutshell covers all substantial user, programming, administration, and networking commands for the most common Linux distributions. It's several quick references rolled into one: sed, gawk, RCS, CVS, vi, Emacs, bash, tcsh, regular expressions, package management, bootloaders, and desktop environments are all covered in this clear, to-the-point volume, along with core command-line utilities. The fourth edition continues to track the major changes in bootloaders, the GNOME and KDE desktops, and general Unix commands. Several commands related to CDs and music reflect the evolution of multimedia on Linux. Coverage has been added for GRUB, which has become the default bootloader on several Linux distributions, and for vim, the popular and feature-loaded extension to vi. The addition of several new options to the iptables firewall command and new commands related to DNSSEC and ssh show the book's value as a security tool. With this book, you no longer have to grope through long manpages and info documents for the information you need; you'll find it here in clear language and an easy-to-read format. Contents include:

• Programming, system administration, networking, and user commands with complete lists of options
• GRUB, LILO, and Loadlin bootloaders
• Shell syntax and variables for the bash, csh, and tcsh shells
• Pattern matching
• Emacs, vi, and vim editing commands
• sed and gawk commands
• The GNOME and KDE desktops and the fvwm2 window manager
• Red Hat and Debian package managers

The intensive search for a more secure operating system has often left everyday, production computers far behind their experimental, research cousins. Now SELinux (Security Enhanced Linux) dramatically changes this. This best-known and most respected security-related extension to Linux embodies the key advances of the security field. Better yet, SELinux is available in widespread and popular distributions of the Linux operating system--including for Debian, Fedora, Gentoo, Red Hat Enterprise Linux, and SUSE--all of it free and open source.

SELinux emerged from research by the National Security Agency and implements classic strong-security measures such as role-based access controls, mandatory access controls, and fine-grained transitions and privilege escalation following the principle of least privilege. It compensates for the inevitable buffer overflows and other weaknesses in applications by isolating them and preventing flaws in one application from spreading to others. The scenarios that cause the most cyber-damage these days--when someone gets a toe-hold on a computer through a vulnerability in a local networked application, such as a Web server, and parlays that toe-hold into pervasive control over the computer system--are prevented on a properly administered SELinux system.

The key, of course, lies in the words "properly administered." A system administrator for SELinux needs a wide range of knowledge, such as the principles behind the system, how to assign different privileges to different groups of users, how to change policies to accommodate new software, and how to log and track what is going on. And this is where SELinux is invaluable. Author Bill McCarty, a security consultant who has briefed numerous government agencies, incorporates his intensive research into SELinux into this small but information-packed book. Topics include:

• A readable and concrete explanation of SELinux concepts and the SELinux security model
• Installation instructions for numerous distributions
• Basic system and user administration
• A detailed dissection of the SELinux policy language
• Examples and guidelines for altering and adding policies

To the outside world, a "supercomputer" appears to be a single system. In fact, it's a cluster of computers that share a local area network and have the ability to work together on a single problem as a team. Many businesses used to consider supercomputing beyond the reach of their budgets, but new Linux applications have made high-performance clusters more affordable than ever. These days, the promise of low-cost supercomputing is one of the main reasons many businesses choose Linux over other operating systems. This new guide covers everything a newcomer to clustering will need to plan, build, and deploy a high-performance Linux cluster. The book focuses on clustering for high-performance computation, although much of its information also applies to clustering for high-availability (failover and disaster recovery). The book discusses the key tools you'll need to get started, including good practices to use while exploring the tools and growing a system. You'll learn about planning, hardware choices, bulk installation of Linux on multiple systems, and other basic considerations. Then, you'll learn about software options that can save you hours--or even weeks--of deployment time. Since a wide variety of options exist in each area of clustering software, the author discusses the pros and cons of the major free software projects and chooses those that are most likely to be helpful to new cluster administrators and programmers. A few of the projects introduced in the book include:

• MPI, the most popular programming library for clusters. This book offers simple but realistic introductory examples along with some pointers for advanced use.
• OSCAR and Rocks, two comprehensive installation and administrative systems
• openMosix (a convenient tool for distributing jobs), Linux kernel extensions that migrate processes transparently for load balancing
• PVFS, one of the parallel filesystems that make clustering I/O easier
• C3, a set of commands for administering multiple systems

Linux's unparalleled functionality and adaptability have made it the main alternative to Unix and Microsoft Windows operating systems. And with good reason. System administrators realize that this robust alternative can greatly improve their operating system's reliability and save them money, too. Linux systems are even less vulnerable to attacks by computer viruses and worms. Not surprisingly, businesses, government agencies, schools, and a wealth of other institutions are all looking to Linux to replace the Windows desktop for these same benefits. Linux in a Windows World takes an in-depth look at exactly how Linux can be brought into an organization that's currently based on Microsoft Windows systems. Featuring a litany of insider tips and techniques, Linux in a Windows World dispenses all the practical advice you need to migrate to this revolutionary open source software. Author Roderick W. Smith, himself a renowned system administrator and Linux convert, understands that the skills required to install, deploy, and maintain Linux are not easy to find. That's why he has tapped the absolute best source of information available: the Linux server experts who have made it their life's work to build and manage the Linux system. The latest in O'Reilly's line of bestselling Linux titles, Linux in a Windows World is an invaluable companion for any system administrator interested in integrating Linux into their Windows environment.

The Linux kernel is one of the most important and far-reaching open-source projects. That is why Novell Press is excited to bring you the second edition of Linux Kernel Development, Robert Love's widely acclaimed insider's look at the Linux kernel. This authoritative, practical guide helps developers better understand the Linux kernel through updated coverage of all the major subsystems as well as new features associated with the Linux 2.6 kernel. You'll be able to take an in-depth look at Linux kernel from both a theoretical and an applied perspective as you cover a wide range of topics, including algorithms, system call interface, paging strategies and kernel synchronization. Get the top information right from the source in Linux Kernel Development.