Download Build Awesome Command-Line Applications in Ruby: Control by David B. Copeland PDF

By David B. Copeland

As Ruby seasoned David Copeland explains, writing a command-line program that's self-documenting, strong, adaptable and without end valuable is simpler than you could imagine. Ruby is very suited for this job, because it combines high-level abstractions with "close to the metal" method interplay wrapped up in a concise, readable syntax. additionally, Ruby has the help of a wealthy environment of open-source instruments and libraries.

Ten insightful chapters every one clarify and reveal a command-line top perform. You'll see find out how to use those instruments to raise the lowliest automation script to a maintainable, polished application.

You'll how you can use unfastened, open resource parsers to create effortless command-line interfaces in addition to command suites. You'll see tips on how to use defaults to maintain innovations easy for daily clients, whereas giving complex clients concepts for extra complicated tasks.

There's no cause a command-line software may still lack documentation, no matter if it's a part of a aid command or a guy web page; you'll discover whilst and the way to take advantage of either. Your trip from command-line amateur to professional ends with a glance at beneficial techniques to trying out your apps, and contains a few enjoyable thoughts for outside-the-box, colourful interfaces that may satisfaction your users.

With Ruby, the command line isn't useless. lengthy dwell the command line.

What You Need:

All you'll desire is Ruby, and the power to put in a number of gem stones alongside the best way. Examples written for Ruby 1.9.2, yet 1.8.7 may still paintings simply as well.

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Extra resources for Build Awesome Command-Line Applications in Ruby: Control Your Computer, Simplify Your Life

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M (x) should be true) and vice versa. Therefore, if there exists an interpretation in which M 1 - Chapter 0 52 then to provide consistency of the formula P & M {[3} we should make an interpretation 1 - {(M1- 2&P1 ~ ~')v (M1 ~ ~'&P1- ~')1 In general, if there are the individual interpretations I~'MI - ~ IN'M1-E then to provide consistency of the formula P & M {D} we need to build an interpretation I N + , ' ( ( M 1 -- ~ ' & P 1 ~ ~') v ( M 1 ~: ~ ' & P 1 - ~'))& & ( ( M 1 - ~ & P 1 r )7) v ( M 1 ~ ~ & P 1 - ~ ) ) & &((M1 - ~'&P1 r ~)v (M1 ~ ~&P1 - s I To simplify the interpretation for the formula P& M { [3 } it is more convenient to write I - { ( M 1 - x, P1 - x) v ( M 1 ~ x & P1 r x)} where x is a free variable.

Any proof can be divided into elementary steps of premises and conclusions. The elementariness means that it is inexpedient to look for more elementary formalisms. As to the validity of each elementary step, it is learned through evidence, or as Descartes says, through intuition. (d) a search must be purposeful (not trial-and-error). and is obtaining knowledge which makes it possible to learn everything within human reach". Thus, Descartes postulates that a method to learn truth exists in the form of a set of rules, even if he does not mention directly the existence of such a method, or its universality.

We used an asterisk to denote the fact that the list above does not stand as a whole for the variable X. The case under consideration occupies an intermediate state between the previous two. e. one may say that a constant object represents itself. The designation with the bound variable V is of the same kind. e. instead of it is simply written as C. Variables and constant objects will be called terms. To sum up all the above considerations of the object we have to introduce the notion of a problem state.

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