Remove unused dirty nonsense files from Git repository with already committed.

remove-ignore-files.sh

#!/bin/sh

# 1. Put your adjusted genuine .gitignore file.

# 2.
git add .gitignore
git commit -m "Placed genuine .gitignore file."

# 3.
git clean -xfd

# 4.
git rm --cached `git ls-files --full-name -i -o --exclude-from=.gitignore`
#git ls-files -i -o --exclude-from=.gitignore | xargs git rm --cached

# 5.
git commit -m "Cleaners worked."

ya1-remove-ignore-files.sh

#!/bin/sh

# https://stackoverflow.com/questions/13541615/how-to-remove-files-that-are-listed-in-the-gitignore-but-still-on-the-repositor

# 1.
git rm -r --cached .

# 2. Put your adjusted genuine .gitignore file.

# 3.
git add .gitignore
git add .

# 4.
git commit -m "Cleaners worked."

ya2-remove-ignore-files.sh

#!/bin/sh

# https://stackoverflow.com/questions/13541615/how-to-remove-files-that-are-listed-in-the-gitignore-but-still-on-the-repositor

# 1. Put your adjusted genuine .gitignore file into /tmp.

git filter-branch --force --index-filter \
  "git ls-files -i -X /tmp/.gitignore | xargs -r git rm --cached --ignore-unmatch -rf" \
  --prune-empty --tag-name-filter cat -- --all