U Command

Reverses the most recent action

	Edit menu: Undo
	Standard toolbar:
	Command line: u

You can enter u as many times as you wish, backing up one step at a time until the drawing is as it was when you began the current editing session.

When an operation cannot be undone, AutoCAD LT displays the command name but performs no action. Actions external to the current drawing, such as plotting or writing to a file, cannot be undone.

If you used mode toggles or transparent commands during a command, their effects are undone along with the main command.

The U command is equivalent to entering UNDO 1. You can also use CTRL and Z to undo.