#!/usr/bin/zsh

dump_url="$1"
dump_file=$(basename "${dump_url%.bz2}")

if [[ ! -f "${dump_file}.bz2" && ! -f "${dump_file}" ]];
then
    wget "${dump_url}"
fi

if [ ! -f "${dump_file}" ];
then
    bunzip2 -d "${dump_file}.bz2"
fi