#!/bin/bash
set -xv

echo "Enter prices."
read price
least=$price
great=$price
count=0
total=0
while [ -n "$price" ]
do
  read price
  if test $price -lt $least
  then
    let least=$price
  fi
  if test $price -gt $great
  then
    let great=$price
  fi
  let total=$total+$price
  let count=$count+1
done
while [ test $total -gt 0 ]
do
  echo "Balance due is $"$total
  echo "Please enter payment."
  read payment
  let $total=$total-$payment
done
echo "Your change due is $"$total
echo "Total number of items: "$count
echo "The cheapest price: $"$least
echo "The most expensive price: $"$great
echo "Thank you for shopping at Unix Electronics!"