One time script for transferring directories from one program to another
The original program had the directories set up as PN#/##/## and always having 5 digits for the id. The new program had the files as # where the length was just the numerical value.
Added comments in the ruby file so you understand how it was transferred.
You will be left with a few empty directories in the base directory all starting with 'PN'. I didn't add an functionality to deal with this. Just delete the folders manually (there will be a max of 10).
As for programming, this was just a quick and dirty script instead of manually moving 11522 directories. I didn't worry about performance.