Also, it depends on how you define an "OS". If you're in the GNU/BSD/Windows/MacOS camp (where init, ls, sh, cat, etc. Are part of the OS), you can have go (as

Also, it depends on how you define an "OS". If you're in the GNU/BSD/Windows/MacOS camp (where init, ls, sh, cat, etc. Are part of the OS), you can have go (as well as java) in the OS.