Download random xkcd and use it as screensaver

lock

#!/bin/sh
# this requires jshon, awk and sed
if ip addr | grep wlan0 | grep UP 2>&1 >/dev/null; then 
        # we have wifi
        URL=$(curl http://c.xkcd.com/random/comic/ --dump-header - | grep Location | awk '{print $2}' | sed 's/\r//g')
        JSON=`curl "$URL"info.0.json`
        wget $(echo $JSON | jshon -e img | sed 's/"//g' | sed 's/\\//g') -O $HOME/.xkcd.png
fi

i3lock -i ~/.xkcd.png -c 000000 -t