.rb

require "fileutils"

# 循环文件夹的块包装
def each_dir(dirname)
  Dir.open(dirname) do |dir|
    dir.each do |name|
      next if name == "."
      next if name == ".."
      yield name
    end
  end
end

# 当前执行目录
pwd = Dir.pwd

each_dir(pwd) do |filename|
  pathname = File.join(pwd, filename)
  if File.directory?(pathname)
    puts pathname
    each_dir(pathname) do |subFilename|
      if /\.mkv$/ =~ subFilename
        print "\t", subFilename, "\n"
        tmp_name = File.join(pathname, subFilename)
        # mv
        FileUtils.mv tmp_name, pwd
      end
    end
    # rm -r
    FileUtils.rm_r pathname
  end
end