Ruby is not just a programming language, but an entire philosophy about programming. It makes programming fun, productive, and rewarding. Most programs consist of code that needs to be organized into functions. And so most Ruby programs consist of classes and modules containing useful functions for interacting with the real world, operating on text, working with objects, creating GUIs, doing system administration tasks, building web applications… you name it. Ruby is at its heart a toolkit for accessing existing libraries like OpenSSL and providing something like Visual Basic style syntactic sugar to make working with them fun.
Travis CI is a hosted, distributed Continuous Integration service used to build and test software projects hosted at GitHub. Travis CI is integrated with GitHub pull requests and supports all programming languages that can be built into docker images, making it very handy to setup.
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Check this article to learn how YUM repository and metadata work internally.
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