download all images from http://xkcd.com/now/

xkcd_now_downloader

#!/bin/bash                                                                                                                                                               

for h in {0..23}
do
    hour=`printf "%02d" $h`
    for minutes in 00 15 30 45 
    do 
        wget https://sslimgs.xkcd.com/comics/now/${hour}h${minutes}m.png
    done
done

Now if only there were one that got all the comic images, as to create a slideshow