You cannot connect to internet without sh???
Were you manually setting up your connection? Hildon internet connection widget (status area) should work without problem. Also HAM as in the post I linked someone managed to install mksh without sh/bash. Check your installed progs, whether it is fapman or application manager install some shell from it and try to run it from menu. If you reflash, first thing to install is backupmenu, create a clean backup if you like to play with scripts, will save you time