Read e-book online bash Pocket Reference PDF

By Arnold Robbins

ISBN-10: 1449387888

ISBN-13: 9781449387884

It's basic: you want to understand how to paintings with the bash shell on the way to get to the center of Mac OS X, Linux, and different Unix platforms. up to date for the newest model of bash, this concise little e-book places the entire crucial information regarding bash at your fingertips. You'll fast locate solutions to stressful questions that usually arise while you're writing shell scripts -- What characters do you want to cite? How do you get variable substitution to just do what you will want? How do you employ arrays? -- and lots more and plenty extra.

If you're a person or programmer of any Unix version, or if you're utilizing bash on home windows, you'll locate this pocket reference integral. This e-book covers:
* Invoking the Shell
* Syntax
* capabilities
* Variables
* mathematics Expressions
* Command historical past
* Programmable of entirety
* task keep an eye on
* Shell thoughts
* Command Execution
* Coprocesses
* limited Shells
* integrated instructions

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Sample text

Sometimes we mention a Unix application (such as Emacs), without a manualsection suffix and capitalized. This is a clue that the name actually represents a wellestablished family of Unix programs with essentially the same function, and we are discussing generic properties of all of them. Emacs, for example, includes xemacs. At various points later in this book we refer to ‘old school’ and ‘new school’ methods. As with rap music, new-school starts about 1990. In this context, it’s Preface xxx associated with the rise of scripting languages, GUIs, open-source Unixes, and the Web.

Other technologies have come and gone like mayflies. Machines have increased a thousandfold in power, languages have mutated, industry practice has gone through multiple revolutions—and Unix hangs in there, still producing, still paying the bills, and still commanding loyalty from many of the best and brightest software technologists on the planet. One of the many consequences of the exponential power-versus-time curve in computing, and the corresponding pace of software development, is that 50% of what one knows becomes obsolete over every 18 months.

We all know this is true (it’s why we have compilers and interpreters, after all) but we often don’t think about the implications. High-level-language code that’s repetitive and mind-numbing for humans to write is just as productive a target for a code generator as machine code. It pays to use code generators when they can raise the level of abstraction—that is, when the specification language for the generator is simpler than the generated code, and the code doesn’t have to be hand-hacked afterwards.

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bash Pocket Reference by Arnold Robbins


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