Debian is a free operating system ( OS ) for your computer. An operating system is the set of basic programs and utilities that make your computer run. Debian uses the Linux kernel (the core of an OS) along with thousands of software packages (also called 'packages') that are each distributed in a separate file. The packages contain the program code that does all the work, and are connected to each other in what is called a package dependency hierarchy . Each package depends on some smaller package or packages, which in turn depend on even smaller packages, and so on.
A Ruby Gem is a package that contains code and executables. A Ruby Gem package allows developers to bundle up the code into a single package that can be installed through one process. Gem is great for shell scripting, system administration, and application scripting. You can easily open a local or remote file on the command line. gem goes beyond simply splitting lines of files; it does word splitting too. And you can check to see if two words are in the same group made of delimited words.
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Check this article to learn how RubyGem index and metadata work internally.
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