Some commands which help you to clean your git commit history.

github-cleansing.sh

# Sign all previous commits
git rebase --root --exec "git commit --amend --author='Talha Asghar <talhaasghar.contact@simplelogin.fr>' --no-edit --allow-empty"
git rebase --committer-date-is-author-date --root
git push -f

# Sign all commits to-date but dont touch commits before this point in history .i.e. commit hash "SHA256HASHEXAMPLE0000"
# Replace "SHA256HASHEXAMPLE0000" with your commit hash
git rebase SHA256HASHEXAMPLE0000 --exec "git commit --amend --author='Talha Asghar <talhaasghar.contact@simplelogin.fr>' --no-edit --allow-empty"
git rebase --committer-date-is-author-date SHA256HASHEXAMPLE0000
git push -f

# to clone repos from a text file having those repos' links
while read p; do git clone  "$p"; done < ~/Documents/github-cleaning/sources.txt 

# to do something in subdirectories
for d in ./*/ ; do (cd "$d" && pwd); done

# search for all readmes in subdirectories
for i in $(find . -maxdepth 2 -type f -iname readme*); do echo $i;done