See http://www.jpsoft.com/
4DOS ver. 7.5 has just been released for free. It is 16 bit and says that
it only runs on Win9x/Me, but I wonder if it might work in the NT DOS
subsystem.
These are replacement console shells for command.com or cmd.exe. They have
a lot more functionality than the MS programs; I'd put them as a lot closer
to bash in functionality than command.com/cmd.exe. in some ways they may be
more functional than bash, in others less. I'm still at ver. 5.5 so I
really couldn't compare.