Linux is most certainly not Unix, nor is it a subset of Unix. Some people prefer to refer to Linux as GNU/Linux, because it is built using many GNU tools (compiler, libraries, applications etc.). GNU stands for "GNU's Not Unix". Linux is however POSIX-compliant, which means that it adheres to a certain set of standards governing the user and software interfaces that an operating system must have.
Quote: "No offense but if linux ever wants to get big, it will change to closed source"
Firstly, Linux can never change to being closed source, because the license it is distributed under (the General Public License or GPL) expressly forbids this. Secondly, one of the core principles of open software is that it is safer from a security perspective exactly because the code is open - more people looking at the code means, in theory, that potential vulnerabilities are fixed quicker.
This is somewhat like commonly used encryption algorithms (such as AES) - they are hard to break despite the fact that the algorithm is publically available. In fact, because these algorithms are well known, it is possible for them to be more thouroughly tested and proved to be difficult to break (since more mathematicians have been able to examine them)
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