photo moved by date. windowsでうまくeachが動かなかった？のでfor文を使ってる。 作成日付を元にファイルを移動する

photo_moved_by_date.rb

require 'fileutils'
require 'rubygems'
require 'find'

inDir = "C:/Users/KENT/Pictures/old/"
outDir = "C:/Users/KENT/Pictures/new/"

list = []
Find.find(File.expand_path(inDir)){ |path|
  if /.*(jpg|JPG|jpeg|JPEG|mp4|MP4|png|PNG|wmv|mov|MOV|DNG|AVI|gif|GIF|avi|ASF)\z/ =~ path
    list << path
  end
}
Dir.mkdir(outDir) unless File.exist?(outDir)
for num in 0..list.size - 1 do
  path = list[num]
  foldername = File::mtime(path).strftime('%Y%m')
  folderpath = outDir + foldername
  Dir.mkdir(folderpath) unless File.exist?(folderpath)
  p path + " >>> " + folderpath + File::mtime(path).strftime('/%Y-%m-%d_') + File::basename(path)
  FileUtils.mv(path, folderpath + File::mtime(path).strftime('/%Y-%m-%d_') + File::basename(path))
end