jSH is a script interpreter for DOS based operating systems like MS-DOS, FreeDOS or any DOS based Windows (like 95, 98, ME). The focus is on file io and text mode user interfaces. jSH is a side project to DOjS, a Javascript canvas for creative coding. jSH is available on the jSH GitHub under several licenses, including the MIT license, the ISC license, Dzcomm (gift-ware, not really open source), and WATTCP. You can find binary releases on the jSH release page. Just extract the contents of the archive and run jSH.