REMOVING "-" FROM SOME FILE NAMES

[fire772]

I HAVE SAVED SOME 6400 FILES IN DIFFERENT DIRECTORY AND SUBFOLDERS AND GAVE THEM A DATE SEQUANCE ie 2001 01 012001 05 27and some 2001- 01- 052001- 04 -27 how do I remove the "-" from the file names I'm guessing it's with power shell but not sure how to handle the spacescan I do multiple folders with subfolders or do I need to do each folder

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