That was our first shell we used for debugging before we had emscripten working.
The shell currently used in the demo is dash, compiled with emscripten: https://github.com/plasma-umass/browsix/blob/master/src/dash...
Which ends up in the build through our gulpfile: https://github.com/plasma-umass/browsix/blob/master/gulpfile...
https://github.com/plasma-umass/browsix/blob/master/src/bin/...
It doesn't do much, and certainly does not qualify as being unmodified existing code (which is what this whole system is supposed to be able to run as one of its benefits.)