#!/bin/bash

(( $# == 0 )) && { echo "Usage: $0 START END"; exit; }

declare -i start="$1"
declare -i end="$2"
# Normal array, because sort order of associative array is unpredictable
declare -a array=("Fizz" 3 "Buzz" 5 "Fluzz" 7)

(( start > end )) && { echo "Error: start ($start) > end ($end)"; exit; }

for (( i=start; i<=end; i++ ))
do
    out=
    for (( j=1; j < ${#array[@]}; j+=2 ))
    do
        if (( i % ${array[$j]} == 0 )); then
            out+="${array[$((j-1))]}"
        fi
    done
    [[ -z $out ]] && out="$i"
    echo "$out"
done