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bash Cookbook: Solutions and Examples for bash Users

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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.

As with any general programming language, there is more than one way to do a given task. In some cases, there is only one best way, but in most cases there are at least two or three equally effective and efficient ways to write a solution. Which way you choose depends on your personal style, creativity, and familiarity with different commands and techniques. This is as true for us as authors as it is for you as the reader. In most cases we will choose a single method and implement it. In a few cases we may choose a particular method and explain why we think it’s the best. We may also occasionally show more than one equivalent solution so you can choose the one that best fits your needs and environment.

There is also sometimes a choice between a clever way to write some code, and a readable way. We will choose the readable way every time because experience has taught us that no matter how transparent you think your clever code is now, six or eighteen months and 10 projects from now, you will be scratching your head asking yourself what you were thinking. Trust us, write clear code, and document it—you’ll thank yourself (and us) later.

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Wicked Cool Shell Scripts, 2nd Edition: 101 Scripts for Linux, OS X, and UNIX Systems
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