Delete all local branches but master and the current one
git branch | grep -v "master" | grep -v ^* | xargs git branch -D;
what did I do? aka git last commit
git diff @~..@
What did I do the last week?
git log --stat --since='1 Week Ago' --graph --pretty=oneline --abbrev-commit --date=relative
git log only the relevant merges
git log --all --graph --decorate --oneline --simplify-by-decoration
show all untracked files
git ls-files --others --exclude-standard
last tag
describe --tags --abbrev=0