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GNU is a recursive acronym for "GNU's Not Unix!", [6] [12] chosen because GNU's design is Unix-like, but differs from Unix by being free software and containing no Unix code. [ 6 ] [ 13 ] [ 14 ] Stallman chose the name by using various plays on words, including the song The Gnu .
The GNU Project was not, is not, a project to develop specific software packages. [...] Many people have made major contributions to the free software in the system, and they all deserve credit. But the reason it is an integrated system—and not just a collection of useful programs—is because the GNU Project set out to make it one.
XNU ("X is Not Unix") is the computer operating system (OS) kernel developed at Apple Inc. since December 1996 for use in the Mac OS X (now macOS) operating system and released as free and open-source software as part of the Darwin OS, which, in addition to being the basis for macOS, is also the basis for Apple TV Software, iOS, iPadOS, watchOS, visionOS, and tvOS.
The main goal was to create many other applications to be like the Unix system. GNU was able to run Unix programs but was not identical to it. GNU incorporated longer file names, file version numbers, and a crash-proof file system. The GNU Manifesto was written to gain support and participation from others for the project.
A Unix-like (sometimes referred to as UN*X, *nix or *NIX) operating system is one that behaves in a manner similar to a Unix system, although not necessarily conforming to or being certified to any version of the Single UNIX Specification. A Unix-like application is one that behaves like the corresponding Unix command or shell.
The name GNU is a recursive acronym for "GNU's Not Unix". [17] Soon after, he started a nonprofit corporation called the Free Software Foundation to employ free software programmers and provide a legal infrastructure for the free software movement.
XINU Is Not Unix (XINU, a recursive acronym), is an operating system for embedded systems, [2] originally developed by Douglas Comer for educational use at Purdue University in the 1980s. The name is both recursive, and is Unix spelled backwards.
The Open Group requests that UNIX always be used as an adjective followed by a generic term such as system to help avoid the creation of a genericized trademark. Unix was the original formatting, [disputed – discuss] but the usage of UNIX remains widespread because it was once typeset in small caps (Unix).