The rules I use to organize my download folder

maid-rules.rb

require "fileutils"

Maid.rules do

  rule "debian packages" do
    move(dir("~/Downloads/*.deb"), "~/Downloads/deb")
  end

  rule "compressed" do
    move(dir("~/Downloads/*.(zip|tar.gz|rar|tar.bz2|tgz)"), "~/Downloads/compressed")
  end

  rule "PDFs" do
    move(dir("~/Downloads/*.(pdf|mobi)"), "~/Downloads/pdfs")
  end

  rule "images" do
    move(dir("~/Downloads/*.(jpg|jpeg|gif|png|eps)"), "~/Downloads/images")
  end

  rule "videos" do
    move(dir("~/Downloads/*.(mkv|mp4|avi)"), "~/Downloads/videos")
  end

  rule "audio" do
    move(dir("~/Downloads/*.mp3"), "~/Downloads/audio")
  end

  rule "screenshots" do
    Dir.foreach("/home/aniket/Pictures") {
      |filename|
      fullpath = "/home/aniket/Pictures/#{filename}"
      create_time = (/\w+-\w+-\w+[[:blank:]]\w+:\w+:\w+/.match(filename)).to_s
      date = create_time.split[0].to_s
      year = date.split("-")[0].to_s
      month = date.split("-")[1].to_s
      if year and month != ""
        finalpath = "/home/aniket/Pictures/Screenshots/#{year}/#{month}"
        FileUtils.mkdir_p(finalpath)
        FileUtils.mv fullpath, finalpath
      end
    }
  end

end