#!/bin/sh
# Usage: ./download.sh https://www.a.url/to/download filename_for_downloaded.file
# Usage: ./download.sh https://www.a.url/to/download filename_for_downloaded.file a_username a_password
URL=$1
FILENAME=$2

if [ "$#" -gt 2 ]; then
    USERNAME=$3
    PASSWORD=$4
    curl -L -o "${FILENAME}" -u "${USERNAME}:${PASSWORD}" ${URL}
else
    curl -L -o "${FILENAME}" ${URL}
fi