GNU, or otherwise known as “not Unix” is an operating system and an extensive array of computer software. GN{U is derived from free software, most of which is licensed under the GNU Project’s own General Public License.
It is different from Unix because it contains free software and no Unix code. Non-GNU kernels, most of all, the Linux kernel, can be used with GNU software. Unix is also an operating system with entirely free tools. Unix was created as a multi-user system with multi-user computer systems which are obtained from the original AT&T Unix.
Development began in the 1970s at the Bell Labs research center. AT&T licensed Unix to outside entities in the late 1970s, which led to a variety of both academic and commercial Unix variants.
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