>Does anyone know of an alternate Korn shell or test that I can use on MPE?

There is a (quick and dirty) prototype of GNU bash available on Jazz,
in the CVS respository. You can find details (and cvsweb access as well
as info, how to cvs checkout remotely) on the pages where the GNU core,
compiler, etc are offered.

Lars (no idea, if that bash will handle [[ ]] tests differently, though)