The Tcl/Tk combination is increasingly popular because it lets you produce sophisticated graphical interfaces with a few easy commands, develop and change scripts quickly, and conveniently tie together existing utilities or programming libraries. The Tcl/Tk Pocket Reference,a handy reference guide to the basic Tcl language elements, Tcl and Tk commands, and Tk widgets, is a companion volume to Tcl/Tk in a Nutshell. Read more

You've experienced the shiny, point-and-click surface of your Linux computer—now dive below and explore its depths with the power of the command line.Learn Linux Quickly takes you from your very first terminal keystrokes to writing full programs in Bash, the most popular Linux shell (or command line). Along the way, you'll learn the timeless skills handed down by generations of experienced, mouse-shunning gurus: file navigation, environment configuration, command chaining, pattern matching, and more.In addition to that practical knowledge, we reveal the philosophy behind these tools and the rich heritage that your desktop Linux machine has inherited from Unix mainframes of yore. As you make your way through the book's short, easily digestible chapters, you'll learn how to:Create and delete files, directories, and symlinksAdminister your system, including account creation, package installation, and process managementUse standard input and output, redirection, and pipelinesEdit files with Vim, the world's most popular text editorWrite shell scripts to automate common or boring tasksSlice and dice text files with grep, sed, uniq, and sortOnce you overcome your initial "shell shock", you'll find that the command line is a natural and expressive way to communicate with your computer. Just don't be surprised if your mouse starts to gather dust. Read more

Master Linux Shells – Your Complete Guide to Practical Success with Bash, Zsh, PowerShellKey FeaturesEmbrace Bash, Zsh, and PowerShell across Linux, macOS, UnixSeamlessly progress through chapters with conceptual explanations, illustrative examples, and immersive labs for hands-on skill developmentBuild real-world Linux administration scripts, enhancing your troubleshooting and management skillsBook DescriptionEmbark on a comprehensive journey through command shells with this hands-on manual. While Bash is a Linux staple, Z shell and PowerShell are rising stars, applicable to Linux, macOS, and Unix. Progress seamlessly through chapters, each building on the last, creating a solid foundation. Learn through a unique approach: concepts, examples, and interactive labs. These labs, nearly a hundred strong, form the core of experiential learning, essential for script creation.Focusing on Linux commands and their scripting applications, this manual is universally relevant across Linux and select Unix-like systems. It goes beyond theory, offering practical scripts for real-world Linux administration. Scripts are designed for manageability, aiding learning and troubleshooting. The goal is to nurture the ability to craft intelligent, functional shell scripts.While centered on Bash, this book offers a peek into the future with Z Shell and PowerShell, expanding your skills and adaptability. This book is systematically structured and engaging so that it will guide you to master command shells, equipping you for real-world Linux challenges.What you will learnGrasp the concept of shells and explore their diverse types for varied system interactionsMaster redirection, pipes, and compound commands for efficient shell operationsLeverage text stream filters within scripts for dynamic data manipulationHarness functions and build libraries to create modular and reusable shell scriptsExplore the basic programming constructs that apply to all programming languagesEngineer portable shell scripts, ensuring compatibility across diverse platforms beyond LinuxWho this book is forThis book is for programmers who use the command line on Unix and Linux servers already, but don't write primarily in Bash. This book is ideal for programmers who've been using a scripting language such as Python, JavaScript or PHP, and would like to understand and use Bash more effectively. It’s also great for beginning programmers, who want to learn programming concepts.Table of ContentsShell BasicsInterpreting CommandsUnderstanding Variables and PipelinesUnderstanding Input/Output RedirectionCustomizing the EnvironmentText Stream Filters – Part 1Text Stream Filters – Part 2Basic Shell Script ConstructionFiltering Text with grep, sed, and Regular ExpressionsUnderstanding FunctionsPerforming Mathematical OperationsCreating here DocumentsScripting with ImageMagickShell Scripting for Security ProfessionalsUsing awk–Part 1Using awk–Part 2Creating User Interfaces with yad and dialogUsing Shell Script Options with getops and shiftShell Script SecurityShell Script PortabilityDebugging Shell ScriptsUsing PowerShell on Linux Read more

Master the art of offensive bash scripting. This highly practical hands-on guide covers chaining commands together, automating tasks, crafting living-off-the-land attacks, and more!In the hands of the penetration tester, bash scripting becomes a powerful offensive security tool. In Black Hat Bash, you’ll learn how to use bash to automate tasks, develop custom tools, uncover vulnerabilities, and execute advanced, living-off-the-land attacks against Linux servers. You’ll build a toolbox of bash scripts that will save you hours of manual work. And your only prerequisite is basic familiarity with the Linux operating system.You’ll learn the basics of bash syntax, then set up a Kali Linux lab to apply your skills across each stage of a penetration test—from initial access to data exfiltration. Along the way, you’ll learn how to perform OS command injection, access remote machines, gather information stealthily, and navigate restricted networks to find the crown jewels. Hands-on exercises throughout will have you applying your newfound skills.Key topics covered include:Bash scripting essentials: From control structures, functions, loops, and text manipulation with grep, awk, and sed.How to set up your lab: Create a hacking environment with Kali and Docker and install additional tools.Reconnaissance and vulnerability scanning: Learn how to perform host discovery, fuzzing, and port scanning using tools like Wfuzz, Nmap, and Nuclei.Exploitation and privilege escalation: Establish web and reverse shells, and maintain continuous access.Defense evasion and lateral movement: Audit hosts for landmines, avoid detection, and move through networks to uncover additional targets.Whether you’re a pentester, a bug bounty hunter, or a student entering the cybersecurity field, Black Hat Bash will teach you how to automate, customize, and optimize your offensive security strategies quickly and efficiently, with no true sorcery required. Read more

Practical, in-depth knowledge of the system programming interfaces that drive the UNIX and Linux kernelsBuilding on W. Rich Stevens’ pioneering work, this third edition of the classic was updated by Steve Rago, a colleague of Stevens, to reflect technical advances and best practices aligning with Version 4 of the Single UNIX Specification.This edition covers more than seventy interfaces including:POSIX asynchronous I/OSpin locksBarriersPOSIX semaphoresSteve carefully retains the spirit and approach that have made this book so valuable, starting with files, directories, and processes, carefully laying the groundwork for more advanced techniques, such as signal handling and terminal I/O. And he thoroughly covers threads and multithreaded programming, and socket-based IPC.Filled with examples, case-studies, and access to thousands of lines of downloadable code, Advanced Programming in the UNIX® Environment has helped generations of programmers write code with exceptional power, performance, and reliability. Read more

DNS and BIND tells you everything you need to work with one of the Internet's fundamental building blocks: the distributed host information database that's responsible for translating names into addresses, routing mail to its proper destination, and even listing phone numbers with the new ENUM standard. This book brings you up-to-date with the latest changes in this crucial service.The fifth edition covers BIND 9.3.2, the most recent release of the BIND 9 series, as well as BIND 8.4.7. BIND 9.3.2 contains further improvements in security and IPv6 support, and important new features such as internationalized domain names, ENUM (electronic numbering), and SPF (the Sender Policy Framework).Whether you're an administrator involved with DNS on a daily basis or a user who wants to be more informed about the Internet and how it works, you'll find that this book is essential reading. Topics include: What DNS does, how it works, and when you need to use itHow to find your own place in the Internet's namespaceSetting up name serversUsing MX records to route mailConfiguring hosts to use DNS name serversSubdividing domains (parenting)Securing your name server: restricting who can query your server, preventing unauthorized zone transfers, avoiding bogus servers, etc.The DNS Security Extensions (DNSSEC) and Transaction Signatures (TSIG)Mapping one name to several servers for load sharingDynamic updates, asynchronous notification of change to a zone, and incremental zone transfersTroubleshooting: using nslookup and dig, reading debugging output, common problemsDNS programming using the resolver library and Perl's Net::DNS module Read more

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O'Reilly's bestselling book on Linux's bash shell is at it again. Now that Linux is an established player both as a server and on the desktop Learning the bash Shell has been updated and refreshed to account for all the latest changes. Indeed, this third edition serves as the most valuable guide yet to the bash shell. As any good programmer knows, the first thing users of the Linux operating system come face to face with is the shell the UNIX term for a user interface to the system. In other words, it's what lets you communicate with the computer via the keyboard and display. Mastering the bash shell might sound fairly simple but it isn't. In truth, there are many complexities that need careful explanation, which is just what Learning the bash Shell provides. If you are new to shell programming, the book provides an excellent introduction, covering everything from the most basic to the most advanced features. And if you've been writing shell scripts for years, it offers a great way to find out what the new shell offers. Learning the bash Shell is also full of practical examples of shell commands and programs that will make everyday use of Linux that much easier. With this book, programmers will learn: How to install bash as your login shellThe basics of interactive shell use, including UNIX file and directory structures, standard I/O, and background jobsCommand line editing, history substitution, and key bindingsHow to customize your shell environment without programmingThe nuts and bolts of basic shell programming, flow control structures, command-line options and typed variablesProcess handling, from job control to processes, coroutines and subshellsDebugging techniques, such as trace and verbose modesTechniques for implementing system-wide shell customization and features related to system security Read more

Un ninja posee distintas habilidades: es sigiloso, teclea sin ser escuchado, se infiltra en sistemas de forma legal, maneja armas y exploits, usa herramientas especializadas como Bash. Es experto en adaptarse mediante variables del entorno, tiene un agudo sentido de orientación navegando por las distintas rutas del sistema. Además, destaca en recolección de información de logs, manipulación de expresiones regulares, resistencia física ante la pantalla, memoria excepcional para recordar los distintos parámetros de un comando, todo combinado con una notable destreza para ejecutar sus misiones con astucia y efectividad. ¿Quieres ser un Ninja?.En este libro, aprenderás a trabajar con la consola de comandos de una forma simple e intuitiva, sin complicaciones innecesarias. Verás cómo se gestionan los usuarios, directorios, permisos, dispositivos y redes en Linux. Entenderás la importancia de conocer los módulos del kernel y su operación durante el arranque del sistema. Trabajaremos con paquetes de software y sus procesos. El entrenamiento comenzará con explicaciones claras, ejemplos prácticos y un enfoque profesional. Este libro te llevará de lo básico a lo avanzado en tres disciplinas clave: SysAdmin, Forensic y Hacking. Ya seas un administrador de sistemas que busca optimizar su trabajo diario, un analista forense informático que está desplegando su nuevo laboratorio forense, o un pentester que tiene que descubrir las vulnerabilidades de una infraestructura, con este libro entenderás a bajo nivel cómo funciona Linux y podrás aprovechar todas las ventajas que este sistema y sus herramientas te ofrecen.Prepárate para dominar Linux desde cero. Este libro no es solo una colección de herramientas y comandos, es una guía para convertirte en un ninja de Linux. Pero recuerda: para ser un ninja hay que entrenar duro, y en Linux se entrena en el cuerpo a cuerpo con la consola de comandos, no basta con leer, hay que teclear.Con el libro, para los que nunca hayan utilizado Linux, se incluye en forma de capítulo cero el acceso gratuito a un videotutorial, accesible desde este enlace: https://glider.es/VideoLinuxCeroNinja , en el que se explican de forma muy sencilla los pasos iniciales para poder instalar una distribución Linux en tu ordenador, ya sea directamente en el disco duro, en una máquina virtual o en un live-USB no persistente. Luego ya podrás seguir leyendo el resto de capítulos, sin miedo a no saber por dónde comenzar en Linux.¡Nos vemos en la consola de Linux!Manuel Guerra Read more

The fascinating story of how Unix began and how it took over the world. Brian Kernighan was a member of the original group of Unix developers, the creator of several fundamental Unix programs, and the co-author of classic books like "The C Programming Language" and "The Unix Programming Environment." Read more

“As an author, editor, and publisher, I never paid much attention to the competition―except in a few cases. This is one of those cases. The UNIX System Administration Handbook is one of the few books we ever measured ourselves against.”―Tim O’Reilly, founder of O’Reilly Media“This edition is for those whose systems live in the cloud or in virtualized data centers; those whose administrative work largely takes the form of automation and configuration source code; those who collaborate closely with developers, network engineers, compliance officers, and all the other worker bees who inhabit the modern hive.”―Paul Vixie, Internet Hall of Fame-recognized innovator and founder of ISC and Farsight Security“This book is fun and functional as a desktop reference. If you use UNIX and Linux systems, you need this book in your short-reach library. It covers a bit of the systems’ history but doesn’t bloviate. It’s just straight-forward information delivered in a colorful and memorable fashion.”―Jason A. NunnelleyUNIX® and Linux® System Administration Handbook, Fifth Edition, is today’s definitive guide to installing, configuring, and maintaining any UNIX or Linux system, including systems that supply core Internet and cloud infrastructure.Updated for new distributions and cloud environments, this comprehensive guide covers best practices for every facet of system administration, including storage management, network design and administration, security, web hosting, automation, configuration management, performance analysis, virtualization, DNS, security, and the management of IT service organizations. The authors―world-class, hands-on technologists―offer indispensable new coverage of cloud platforms, the DevOps philosophy, continuous deployment, containerization, monitoring, and many other essential topics.Whatever your role in running systems and networks built on UNIX or Linux, this conversational, well-written ¿guide will improve your efficiency and help solve your knottiest problems. Read more

Offers real world examples of computer security breeches and discusses common attacks, security policies, configuration and hardware preparation, and system scanning and repair. Read more

The Easy Way to Set Up Your Own Home Server – Even Without Prior Knowledge!Do you want to build your own home server to control your smart home devices, block ads, and create secure local storage?Would you like to expand your IT skills while setting up a cost-effective and flexible solution for your home?Are you tired of standard solutions and want to manage your own system, perfectly tailored to your needs?If you answered “yes” to any of these questions, then this book is perfect for you because...“Your Home Server with Proxmox” will guide you step by step in setting up your own server with Proxmox while integrating three essential tools: Home Assistant, Pi-hole, and TrueNAS. No prior knowledge required—completely independent of expensive commercial solutions!What You’ll Learn in This Book:Proxmox as the Core: Learn how to set up virtual machines and containers with Proxmox to efficiently and securely integrate all your applications.Home Assistant for Your Smart Home: Manage all your smart home devices—from lights to thermostats—on a single platform.Pi-hole for More Privacy: Block ads and tracking across your entire network, improving both speed and security.TrueNAS for Your Storage: Build a secure local storage system that you can access anytime.Why This Book?Beginner-Friendly & Practical: Every step is clearly explained—even without prior IT knowledge.Detailed Instructions: From hardware selection to installation and advanced configurations, everything is covered.Maximum Control: Take full control of your smart home and network—everything runs securely and efficiently on your own server.📌 Practical Tips: Save time and effort with best practices and helpful real-world tips.Start Your "Home Server" Project Now!With this guide, you’ll quickly set up a powerful home server that meets all your needs—secure, customizable, and efficient. Become your own system administrator and design your digital home exactly the way you want it!Let’s get started—enjoy setting up your home server! 🚀 Read more

Have you ever wondered:How do I set a static IP on RedHat/Fedora?How do I install software on Slackware?How do I start and stop services on BSD?How do I list disks in AIX?How to I setup a ZFS file system on Solaris?This guide is designed to answer these questions and highlight the differences between popular *nix systems on the command line. It covers the most popular Unix-like platforms in use today, including:Unix: AIX, Solaris, & HP-UXBSD: FreeBSD, OpenBSD, NetBSD, & Mac OS XLinux: RedHat/Fedora/CentOS, Debian/Ubuntu, Gentoo, openSUSE, Arch Linux, SlackwareUsing the information in this guide, you will be able to easily move between these operating systems and understand the most essential command line utilities for tasks like:Software InstallationUser ManagementHardware ManagementNetworkingDisks and File SystemsMonitoring and TroubleshootingRunlevels, Init, and Startup/Shutdown Read more

New Edition - October 2024Discover the World of Linux: Your Complete Beginner's Guide to Using the Most Powerful Operating SystemAre you eager to explore Linux but unsure where to start? Do you find yourself overwhelmed by the variety of Linux distributions and not know which one suits your needs best? If you're ready to learn step by step, this book is for you!Linux is not just an operating system; it’s the backbone of our digital world. Here are some compelling statistics that illustrate its significance in 2024:100% of the world’s supercomputers run on Linux.Over 95% of the top one million websites globally are powered by Linux.90% of the world’s public cloud workloads operate on Linux.Linux powers approximately 70% of all web servers globally.All leading cloud hosting providers utilize Linux.This beginner-friendly guide is designed to introduce you to Linux in a clear and accessible manner, ensuring that you can confidently navigate and utilize this powerful operating system.In this book, you will discover:The fundamentals: What is an operating system? How has Linux evolved, and what makes it unique?An overview of the architecture and file hierarchy of Linux, explained simply.The many benefits of using Linux as your operating system.A breakdown of popular Linux distributions, helping you choose the right one for your specific needs.Step-by-step instructions on installing Linux on Virtual Machines for both Windows and macOS.An exploration of Linux shells: What they are, how to access them, and basic shell scripting concepts.Techniques to make the most of powerful Linux commands.How to set up user access levels and privileges in Linux.Practical tips for utilizing Linux in network administration.Great Linux alternatives to popular Windows applications and much more!Whether you want to enhance your skill set for networking, programming, or even simple web browsing, this book provides the perfect foundation. The easy-to-follow approach ensures you can apply your newfound knowledge immediately.To help reinforce your learning, each chapter concludes with a quiz to test your understanding, with answers provided shortly after.If you’re ready to embark on your Linux journey and unlock its full potential, click Buy Now to get started today! Read more

You've experienced the shiny, point-and-click surface of your Linux computer--now dive below and explore its depths with the power of the command line.The Linux Command Line takes you from your very first terminal keystrokes to writing full programs in Bash, the most popular Linux shell (or command line). Along the way you'll learn the timeless skills handed down by generations of experienced, mouse-shunning gurus: file navigation, environment configuration, command chaining, pattern matching with regular expressions, and more.In addition to that practical knowledge, author William Shotts reveals the philosophy behind these tools and the rich heritage that your desktop Linux machine has inherited from Unix supercomputers of yore.As you make your way through the book's short, easily-digestible chapters, you'll learn how to:  •  Create and delete files, directories, and symlinks  •  Administer your system, including networking, package installation, and process management  •  Use standard input and output, redirection, and pipelines  •  Edit files with Vi, the world's most popular text editor  •  Write shell scripts to automate common or boring tasks  •  Slice and dice text files with cut, paste, grep, patch, and sedOnce you overcome your initial "shell shock," you'll find that the command line is a natural and expressive way to communicate with your computer. Just don't be surprised if your mouse starts to gather dust. Read more

The most complete, authoritative technical guide to the FreeBSD kernel’s internal structure has now been extensively updated to cover all major improvements between Versions 5 and 11. Approximately one-third of this edition’s content is completely new, and another one-third has been extensively rewritten.Three long-time FreeBSD project leaders begin with a concise overview of the FreeBSD kernel’s current design and implementation. Next, they cover the FreeBSD kernel from the system-call level down–from the interface to the kernel to the hardware. Explaining key design decisions, they detail the concepts, data structures, and algorithms used in implementing each significant system facility, including process management, security, virtual memory, the I/O system, filesystems, socket IPC, and networking.This Second Edition• Explains highly scalable and lightweight virtualization using FreeBSD jails, and virtual-machine acceleration with Xen and Virtio device paravirtualization• Describes new security features such as Capsicum sandboxing and GELI cryptographic disk protection• Fully covers NFSv4 and Open Solaris ZFS support• Introduces FreeBSD’s enhanced volume management and new journaled soft updates• Explains DTrace’s fine-grained process debugging/profiling• Reflects major improvements to networking, wireless, and USB supportReaders can use this guide as both a working reference and an in-depth study of a leading contemporary, portable, open source operating system. Technical and sales support professionals will discover both FreeBSD’s capabilities and its limitations. Applications developers will learn how to effectively and efficiently interface with it; system administrators will learn how to maintain, tune, and configure it; and systems programmers will learn how to extend, enhance, and interface with it.Marshall Kirk McKusick writes, consults, and teaches classes on UNIX- and BSD-related subjects. While at the University of California, Berkeley, he implemented the 4.2BSD fast filesystem. He was research computer scientist at the Berkeley Computer Systems Research Group (CSRG), overseeing development and release of 4.3BSD and 4.4BSD. He is a FreeBSD Foundation board member and a long-time FreeBSD committer. Twice president of the Usenix Association, he is also a member of ACM, IEEE, and AAAS.George V. Neville-Neil hacks, writes, teaches, and consults on security, networking, and operating systems. A FreeBSD Foundation board member, he served on the FreeBSD Core Team for four years. Since 2004, he has written the “Kode Vicious” column for Queue and Communications of the ACM. He is vice chair of ACM’s Practitioner Board and a member of Usenix Association, ACM, IEEE, and AAAS.Robert N.M. Watson is a University Lecturer in systems, security, and architecture in the Security Research Group at the University of Cambridge Computer Laboratory. He supervises advanced research in computer architecture, compilers, program analysis, operating systems, networking, and security. A FreeBSD Foundation board member, he served on the Core Team for ten years and has been a committer for fifteen years. He is a member of Usenix Association and ACM. Read more

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If you need to parse or process text data in Linux or Unix, this useful book explains how to use flex and bison to solve your problems quickly. flex & bison is the long-awaited sequel to the classic O'Reilly book, lex & yacc. In the nearly two decades since the original book was published, the flex and bison utilities have proven to be more reliable and more powerful than the original Unix tools. flex & bison covers the same core functionality vital to Linux and Unix program development, along with several important new topics. You'll find revised tutorials for novices and references for advanced users, as well as an explanation of each utility's basic usage and simple, standalone applications you can create with them. With flex & bison, you'll discover the wide range of uses these flexible tools offer. Address syntax crunching that regular expressions tools can't handle Build compilers and interpreters, and handle a wide range of text processing functions Interpret code, configuration files, or any other structured format Learn key programming techniques, including abstract syntax trees and symbol tables Implement a full SQL grammar-with complete sample code Use new features such as pure (reentrant) lexers and parsers, powerful GLR parsers, and interfaces to C++ Read more

Rather than simply running down a list of GIMP's capabilities, Sams Teach Yourself GIMP in 24 Hours actually teaches graphic art techniques and web media creation using GIMP. The GIMP is a fairly complex program with many features and capabilities, but not so complex to be beyond the grasp of most competent computer users. Sams Teach Yourself Gimp in 24 Hours takes you step-by-step through image creation and manipulation and teaches you the techniques for producing high-quality digital art. This book is neither a "dummied down" guide for novice computer users nor an incomprehensible technical reference for UNIX and Linux experts. Read more