operating system (OS) detection in Lua

getOS.lua

function getOS()
	-- ask LuaJIT first
	if jit then
		return jit.os
	end

	-- Unix, Linux variants
	local fh,err = assert(io.popen("uname -o 2>/dev/null","r"))
	if fh then
		osname = fh:read()
	end

	return osname or "Windows"
end

This is a terrible solution for CLI apps, it re-opens and re-initializes conout 4-5 times in a row, leading not just to a seizure-flashing console windows, but also to all kinds of bugs down the road