#! /bin/sh

dl() {
    if [ $# -lt 1 ] || [ $# -gt 2 ]; then
        printf 'usage: dl url [dest]\n' >&2
        return 1
    fi

    if [ $# -eq 2 ]; then
        curl -L -o "$2" "$1"
    else
        curl -L -O -J "$1"
    fi
}

dl "$@"