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To install missing or new packages, you will need some form of software management. The most common implementations include RPM and dpkg. RPM is the RedHat Package Manager, which is used on a variety of Linux systems, eventhough the name does not suggest this. Dpkg is the Debian package management system, which uses an interface called apt-get, that can manage RPM packages as well. Novell Ximian Red Carpet is a third party implementation of RPM with a graphical front-end. Other third party software vendors may have their own installation procedures, sometimes resembling the InstallShield and such, as known on MS Windows and other platforms. As you advance into Linux, you will likely get in touch with one or more of these programs.
1.5.2. GNU/Linux
The Linux kernel (the bones of your system, see Section 3.2.3.1) is not part of the GNU project but uses the same license as GNU software. A great majority of utilities and development tools (the meat of your system), which are not Linux-specific, are taken from the GNU project. Because any usable system must contain both the kernel and at least a minimal set of utilities, some people argue that such a system should be called a GNU/Linux system.