Download Wicked Cool Shell Scripts by Dave Taylor PDF

By Dave Taylor

Shell scripts are an effective strategy to have interaction together with your computing device and deal with your records and method operations. With quite a few strains of code, your laptop will just do what you will want it to do. yet you can even use shell scripts for lots of different crucial (and not-so-essential) projects. This moment variation of depraved Cool Shell Scripts deals a suite of helpful, customizable, and enjoyable shell scripts for fixing universal difficulties and personalizing your computing atmosphere. each one bankruptcy comprises ready-to-use scripts and factors of the way they paintings, why youd are looking to use them, and recommendations for altering and increasing them.

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These scripts can include simple logic, like the if statements you may have seen in other languages, but they can also be even simpler, as you’ll soon see. Many flavors of command line shells, such as tcsh, zsh, and the everpopular bash, are available for OS X, BSD, and Linux operating systems. This book will focus on the mainstay of the Unix environment, bash. Each shell has its own features and capabilities, but the shell that most people first become familiar with on Unix is usually bash. On OS X, the Terminal app will open a window with a bash shell (see Figure 0-1).

Hacking the Script A cool additional hack would be to extend this function to allow scientific notation, as demonstrated in the last example. It wouldn’t be too difficult. You’d test for the presence of 'e' or 'E' and then split the result into three 28 Chapter 1 segments: the decimal portion (always a single digit), the fractional portion, and the power of 10. Then you’d just need to ensure that each is a validint. If you don’t want to require a leading zero before the decimal point, you could also modify the conditional test at  in Listing 1-12.

Creating bite-sized scripts to accomplish specific tasks is at the heart of Unix philosophy. Understanding how to make your own scripts and expand your own Unix systems to better fit your needs will make you a power user. This chapter is just a taste of what is to come in the book: some really wicked cool shell scripts! 8 Chapter 0 1 THE MISSING CODE LIBR A RY One of Unix’s greatest strengths is that it lets you create new commands by combining old ones in novel ways. But even though Unix includes hundreds of commands and there are thousands of ways to combine them, you will still encounter situations where nothing does the job quite right.

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