#!/bin/bash
# script example.sh
declare -a LETTERS
declare -a NUMBERS
NUMBERS=(`array.pl -n`)
LETTERS=($(array.pl))
i=0
while [ $i -lt ${#NUMBERS[@]} ];
do
    echo ${NUMBERS[$i]} is ${LETTERS[$i]}
    i=$((i + 1))
done

./hash.pl | while read key value
do
    echo string: $key, number: $value
done