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