ruby on rails - '$(' is not allowed as a global variable name -

i wrote line:

ruby -e "$(curl -fssl https://raw.githubusercontent.com/homebrew/install/master/install)" 

at command line , it's not working.

i have message:

-e:1: '$(' not allowed global variable name. 

here's screen capture of error:

that script designed install homebrew, mac os x package manager. according screenshot, running on windows.

the reason of error it's caused fact shell on windows different shell on unix systems (specifically in case max os x), therefore commands may different.

apart error itself, whatever trying doesn't make sense @ all. homebrew not designed installed on windows.