From the Preface Every modern operating system has at least one shell, and some have many. Some shells are command line–oriented, such as the shell discussed in this book. Others are graphical, like Windows Explorer or the Macintosh Finder. Some users will interact with the shell only long enough to launch their favorite application, and then never emerge from that until they log off. But most users spend a significant amount of time using the shell. The more you know about your shell, the faster and more productive you can be. Whether you are a system administrator, a programmer, or an end user, there are certainly occasions where a simple (or perhaps not so simple) shell script can save you time and effort, or facilitate consistency and repeatability for some important task. Even using an alias to change or shorten the name of a command you use often can have a significant effect. We’ll cover this and much more. About This Book This book covers bash, the GNU Bourne Again Shell, which is a member of the 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. Ideal readers include: New Unix or Linux users who don’t know much about the shell, but want to do more than point and click Experienced Unix or Linux users and system administrators looking for quick answers to shell scripting questions Programmers who work in a Unix or Linux (or even Windows) environment and want to be more productive New Unix or Linux sysadmins, or those coming from a Windows environment who need to come up to speed quickly Experienced Windows users and sysadmins who want a more powerful scripting environment Who Should Read This Book This book is for anyone who uses a Unix or Linux system, as well as system administrators who may use several systems on any given day. With it, you will be able to create scripts that allow you to accomplish more, in less time, more easily, consistently, and repeatably than ever before. Anyone? Yes. New users will appreciate the sections on automating repetitive tasks, making simple substitutions, and customizing their environment to be more friendly and perhaps behave in more familiar ways. Power users and administrators will find new and different solutions to common tasks and challenges. Advanced users will have a collection of techniques they can use at a moment’s notice to put out the latest fire, without having to remember every little detail of syntax. This book assumes you have access to a Unix or Linux system (or see Recipes 1.14 through 1.18, or Recipe 15.4) and are familiar with logging in, typing basic commands, and using a text editor. You do not have to be root to use the vast majority of the recipes, though there are a few, particularly dealing with installing bash, where root access will be needed. For the second edition, we’ve switched to Asciidoc and Git on O’Reilly’s Atlas system, which worked very well.
✔ Author(s): Carl Albing Ph.D.,JP Vossen
✔ Title: bash Cookbook: Solutions and Examples for bash Users
✔ Rating : 4.5 out of 5 base on (49 reviews)
✔ ISBN-10: 1491975334
✔ Language: English
✔ Format ebook: PDF, EPUB, Kindle, Audio, HTML and MOBI
✔ Device compatibles: Android, iOS, PC and Amazon Kindle
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