git tips

modify the last commit

  git commit --amend

modify the last 5 commit

  git rebase -i HEAD~5

modify pick of which you want to modify to edit and :wq to exit.

  git log

you can find you are at the commit which you edit, do as modify the last commit and

  git commit --amend

back by

  git rebase --continue

undo all the works, back to latest commit state

  git reset --hard HEAD