[LifeQuestioner]

Nothing wrong with broadening an answer, no need to be black and white. Cygwin has been around for ages.

[bitcrazed]

There's a big difference between Cygwin and Bash on Windows though: Cygwin is a Win32 port of the GNU tools, whereas Bash on Windows is a Linux kernel emulation layer that allows you to run unmodified Linux binaries directly on Windows.