Download all wallpapers from national geographic

national_geographic_wallpaper_download.sh

#!/bin/bash

root=http://ngm.nationalgeographic.com
months=(january february march april may june july august september october november december)

download() {
    year=$1
    from=$2
    to=$3
    for month in $(seq $from $to)
        do
            folder=${year}-`printf %02d $month`
            mkdir ${folder}
            curl ${root}/wallpaper/${year}/${months[month - 1]}-ngm-wallpaper |
            grep "Download wallpaper" |
            awk 'BEGIN {FS="\""} {print $2}' |
            while read url
                do
                    wget ${root}${url} --directory-prefix ${folder}
                done
        done
}

download 2011 10 12
download 2012  1 12
download 2013  1  8