Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Sabayon Linux or Sabayon, (formerly RR4 Linux and RR64 Linux), is a Gentoo-based Linux distribution created by Fabio Erculiani and the Sabayon development team.Sabayon Linux differs from Gentoo in that instead of installing the entire system from source code, the initial install is made using packages which are pre-compiled and bundled with the source code. Sabayon Linux currently supports the x86 and x86-64 platforms. Sabayon Linux uses the Entropy system for package management. This system provides binary packages created from the Gentoo Linux unstable tree, compiled using the Portage system, with the result packaged into tarball packages.