Preview:
for k in $(git branch | sed /\*/d); do 
  if [ -z "$(git log -1 --since='1 week ago' -s $k)" ]; then
    git branch -D $k
  fi
done
downloadDownload PNG downloadDownload JPEG downloadDownload SVG

Tip: You can change the style, width & colours of the snippet with the inspect tool before clicking Download!

Click to optimize width for Twitter