Revert Git Permission Changes On Repository Transfer

I recently reinstalled my laptop and copied across my git repositories from an external backup drive. However most of my repositories were flagged by magit as having been updated mainly with the following issue on multiple files:

old mode 100644
new mode 100755

I found a fix for a single repository on stackoverflow but I have quite a few repositories now, so I wrote the following bash script borrowing the core git diff command fix and then ran it in eshell

#!/bin/bash

LIST="DCIM/Art/Content/ArtAssets
DCIM/Art/Content/ArtRage
DCIM/Art/Content/ArtRagePenTool
DCIM/Art/Content/ArtRageTabletFriend
DCIM/Art/Content/InfinitePainter
DCIM/Art/Content/Krita
DCIM/content
bin
publish"

for item in $LIST; do
   echo $item
   cd ~/$item
   git diff -p -R --no-ext-diff --no-color \
      | grep -E "^(diff|(old|new) mode)" --color=never \
      | git apply
done

This is where the integrated nature of emacs can come in useful, although the stackoverflow example was the git diff line I wanted to perform this for each of my repositories and to achieve this I just simply grabbed the Path column output of magit-list-repositories using rectangle-mark-mode and trimmed down using some macros so I could iterate through each repository directory and run the command each time to clean up.