read -p "Are you sure you would like to add this user ID? (Y/n) " OK; OK=${OK:=Y}
if [ "${OK/y/Y}" != 'Y' ] ; then
failure "User ID not added."
read -p "Are you sure you would like to add this user ID? (Y/n) " OK; OK=${OK:=Y}
if [ "${OK/y/Y}" != 'Y' ] ; then
failure "User ID not added."