Undo a "public" change
git revert <SHA>
Link
Fix the last commit message
git commit --amend or git commit --amend -m "Fixes bug #42"
Undo "local" changes
git checkout -- <bad filename>
Reset "local" changes
git reset <last good SHA> ;or git reset --hard <last good SHA>
Redo after undo "local"
git reflog and git reset ;or git checkout
Mass undo/redo
git rebase -i <earlier SHA>
Fix an earlier commit
git commit --squash <SHA of the earlier commit> ;and git rebase --autosquash -i <even earlier SHA>
Stop tracking a tracked file
git rm --cached application.log
Link
