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Cygwin requires a recompile. This is running Ubuntu binaries.

• umanwizard 11y ago
  So it's cygwin + ELF support in the kernel. I guess ability to run GNU tools + supporting ELF is being called "Linux". The latter piece seems pretty minor, especially since most things that run on ubuntu are open-source anyway.
  • monocasa 11y ago
    No, it's supporting all of the linux system calls in the Windows kernel. Epoll, fork, exec, etc. It's a totally different implementation than cygwin.
    • umanwizard 11y ago
      Got it, thanks.
• bitcrazed 11y ago
  Yes - Cygwin is essentially the GNU tools recompiled as Win32 apps using a helper library for shared code etc. Windows Subsystem for Linux (WSL) which underpins Ubuntu on Windows is new Windows kernel infrastructure that exposes a LINUX-compatible syscall API layer to userland and a loader that binds the two. This means you can run real, native, unmodified Linux command-line tools directly on Windows.