We just released a tool to do the right path translation -- wslpath. Unfortunately we haven't added built in usage info yet. Here's a link[1] to usage info in recent Windows Insider flights.

Also, totally fair feedback about the naming. In FCU, we added wsl.exe in addition to bash.exe. It launches into your default shell rather than /bin/bash.

[1] https://github.com/Microsoft/WSL/issues/2715

* I work at Microsoft on WSL