The undo and redo operations are built into most apps where you can edit something. They are so basic that even non tech-savvy users know about them. Hit the ⌘+z to undo or ⌘+⇧+z to redo (or the equivalent on your operating system). Touch interfaces usually use iconography that does the same job. Undo and redo actions are often represented as back and forth iconsSometimes these commands can save the day, but they can also give some headaches and cause serious data loss. I’m a programm...
