如何从服务器目录中制作Paperclip流程文件？

I want to run Paperclip on all files in a directory on the server. Basically, I would like to allow users to FTP some files to my webserver, then I can manually run a rake task to have Paperclip process all of the files (resize the images, update the database, etc). I want to run Paperclip on all files in a direc