git-repo-cleanup.md

• find all commits introduced <string> and show diff
• http://stackoverflow.com/questions/5816134/finding-a-git-commit-that-introduced-a-string-in-any-branch

git log -S <string> --source --all -p

• find all commits changing <filename> and show diff

git log --follow --all -p -- '*<filename>'

• remove remote and show side effects

git br -a
git remote -v
git remote rm <remotename>
git br -a
git remote -v