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why? Linux isn't the only OS in the word you know - and in that case its C or Assembler or possibly C written in C++

Well, Unix and Windows systems are the most widely used OSes and Windows is, currently, of less interest to me.

If It's C hands down in Unix systems, what are the use cases for D/Rust/Go?

I seem to recall that go is meant for massively parallel systems - which reminds me must have a play with it.

Yep. Junior z/OS sysprog here. A little Assembler and some C.