I use Fedora. Today I found GNU (on the web) about which I didn't know till yesterday. I knew that GNU is a Unix-like operating system that is free software but I didn't get why they say GNU's "Not Unix".
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The GNU project chose its recursive acronym for "GNU's Not Unix!" because GNU's design is Unix-like, but differs from it by being free software (while the original Unix was closed-source) and containing no original Unix code (i.e. has been entirely rewritten).