Image Renaming

I had a large directory of images that were all randomly named. None of them had file extensions or anything. So, I wrote up some lines of bash that use ImageMagick to figure out what type of images these were, and then give them a random filename based on the MD5 hash of the current name. This way everything was at least normalized.
Thought I would share this. All the filenames were listed in a file called \"list\".