TO get the arrow key thing working, I had to switch to tcsh. AFAIK csh
doesn't support it. I don't know much about sh and ksh, but I assume the
case is the same for them. bash also supports arrow key history stuff. I
also don't know how to reevaluate a value in csh, but for tcsh prompts,
%~ will give you the current working directory.
Xiamin