Modify the cdh function to set the prompt (PS1) to show the current directory; for example:

Question

/users/pat: cdh /tmp
/tmp: cdh
/users/pat:

Answer 1

This is done by modifying both the -n and default "*" case statement values. In fact, it is an addition of exactly two lines. Here's the segment that shows them (they are both in bold to make it clear what's been added):
-[0-9]|-[0-9][0-9]) # cd to dir in list
i=${1#-} # remove leading '-'
'cd' ${CDHIST[i]}
PS1="$PWD : " ;;
*) # cd to new dir
'cd' $@
PS1="$PWD : " ;;
esac