gistfile1

#!/usr/bin/ruby

require 'fileutils'

ARGV.each do |file|
  begin
    date = File.new(file).mtime
    dir = sprintf('%04d-%02d-%02d', date.year, date.month, date.mday)
    Dir.mkdir(dir) unless File.exist?(dir)
    FileUtils.mv(file, dir)
  rescue => exception
    abort "Error processing #{file}: " + exception.message + "\n" + exception.backtrace.join("\n")
  end
end