git add . && git commit -m 'update' && git push
git log -p -- filename
git blame path/to/file
git remote -v
git remote set-url origin https://git.host/repository.git
for i in */.git; do cd $(dirname $i); git pull; cd ..; done
git diff --name-only HEAD^..HEAD
git filter-branch --force --index-filter \ "git rm --cached --ignore-unmatch path/to/file" \ --prune-empty --tag-name-filter cat -- --all