Your question is a little bit ambiguous.. Do you want to simply have the user enter a date in that format (use the `read` command) or do you want them to enter a date, and have it outputted in that format?
Here's something to ponder meanwhile:
Code:
read -p "Enter the date: " datestring; echo $(date -d "${datestring}" +%D)
So, I enter a date and it formats it like you showed:
Code:
Enter the date: Mar 01 2010
03/01/10