u = Ii::Person.find_by_slug('guest')
old = u.artwork.select{|i| i.created_at < 2.weeks.ago }
files = old.map{|i| i.source_image.path rescue nil}
files.reject!{|f| f.nil? }
folders = []
files.each { |f| folders << f.split('/')[0,f.split('/').size-1].join('/') }
sizes = []
folders.map {|f| sizes << `du -s public#{f}` }
sizes.map! {|s| s.split("\t")[0].to_i }
kilobytes = sizes.sum