I would normally open the parent folder and search for *
in order to select all of the files in subfolders, but in this instance, I have over 1,000,000 files that I need to sort through, so my explorer often crashes when trying to copy that many files through the GUI. I am not sure how much more effective this will be through the command prompt or a batch file, but it is worth a try, I suppose.
What I need to do is make it so that
|parent
| |123
| | 123abc.png
| |456
| | 456def.png
| |789
| | 789ghi.png
becomes
|parent
| 123abc.png
| 456def.png
| 789ghi.png
Yes, my actual file structure has the first 3 characters of the file name given to the folder name, if that can help at all in sorting these.