Gentoo is a free operating system based on either Linux or FreeBSD that can be automatically optimized and customized for just about any application or need.
Portage technology is the heart of Gentoo, and performs many key functions.
Portage is also a package building and installation system. When you want to install a package, you type emerge packagename, at which point Portage automatically builds a custom version of the package to your exact specifications, optimizing it for your hardware and ensuring that the optional features in the package that you want are enabled -- and those you don't want aren't.
Portage also keeps your system up-to-date. Typing emerge -uD world -- one command -- will ensure that all the packages that you want on your system are updated automatically.
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