Well used git

gitcommands.sh

## BEGIN Remove folder retroactively

git filter-branch -f --tree-filter 'rm -rf FOLDERNAME' --prune-empty HEAD
git for-each-ref --format="%(refname)" refs/original/ | xargs -n 1 git update-ref -d
echo FOLDERNAME >> .gitignore
git add .gitignore
git commit -m "Fixing git repo REMOVED: FOLDERNAME"
git gc
git push -f origin master

## END Remove folder retroactively

## BEGIN Remove all files retroactively from repo
git filter-branch -f --tree-filter "find . -type f -name '*.extension' -exec rm {} \;" --prune-empty HEAD
git for-each-ref --format="%(refname)" refs/original/ | xargs -n 1 git update-ref -d
echo *.extension >> .gitignore
git add .gitignore
git commit -m "Fixing git repo REMOVED all files with EXTENSION"
git gc
git push -f origin master

## END Remove all files retroactively from repo