Rackspace Cloud Files: Upload Files Using Linux / Unix FTP Command

I'm using cloud files from Rackspace that provides online storage and CDN for javascript, css, images and video files. However, I found that their online upload is not designed for bulk upload. How do I upload files to Rackspace cloud files storage using standard Linux or Unix ftp client in recursive mode?

Read answer to: "Rackspace Cloud Files: Upload Files Using Linux / Unix FTP Command"