In Linux Shell Script

The Linux Command Line, 2nd Edition

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 sed Once 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.

Mastering Linux Shell Scripting

Master the complexities of Bash shell scripting and unlock the power of shell for your enterpriseAbout This Book* Identify the high level steps such as verifying user input, using command lines and conditional statements in creating and executing simple shell scripts* Create and edit dynamic shell scripts to manage complex and repetitive tasks* Learn about scripting in Perl and programming in Python as a BASH scripting alternative with this practical, step-by-step guideWho This Book Is ForMastering Linux Shell Scripting has been written for Linux administrators who want to automate tasks in their daily lives, saving time and effort. You'll need to have command-line experience and be familiar with the tasks that you need to automate.What You Will Learn* Use the type command to identify the order of command evaluation* Create interactive scripts that prompt for user input* Foster menu structures for operators with little command-line experience* Develop scripts that dynamically edit web configuration files to produce a new virtual host* Write scripts that use AWK to search and reports on log files* Draft effective scripts using functions as building blocks, reducing maintenance and build time* Make informed choices by comparing different script languages such as Perl and Python with BASHIn DetailShell scripting is a quick method to prototype a complex application or a problem by automating tasks when working on Linux-based systems. Using both simple one-line commands and command sequences complex problems can be solved with ease, from text processing to backing up sysadmin tools.In this book, you'll discover everything you need to know to master shell scripting and make informed choices about the elements you employ. Get to grips with the fundamentals of creating and running a script in normal mode, and in debug mode. Learn about various conditional statements' code snippets, and realize the power of repetition and loops in your shell script. Implement functions and edit files using the Stream Editor, script in Perl, program in Python - as well as complete coverage of other scripting languages to ensure you can choose the best tool for your project.Style and approachThe book will capture your attention and keep you engaged with the simplicity and clarity of each explanation. Every step is accompanied with screen captures so you can cross-check the results before moving on.

Advanced Bash Scripting Guide