21May/114
How to install RVM on Windows using cygwin
Ruby enVironment Management (RVM) is a tool to install multiple versions of Ruby which may be necessary when you want to develop or test applications that run on different versions of Ruby. RVM can be installed on Unix like operating systems like Linux or Mac OS. RVM doesn't support Windows operating system yet. But you can overcome this by using cygwin which brings Unix shell tools to Windows.