Try running it under sh. Open a cmd prompt and enter sh to get a sh shell, we also seem to have bash now, so could try entering bash.
Note that command completion and history aren't implemented with sh, which is actually dash.
You could also make a script, poll.sh or such and try running "sh poll.sh". Could get more fancy if that works and make a cmd script starting with extproc sh.exe, see the command reference.