2004

Correct Mistakes | 369
Correct Mistakes
With AutoCAD, you can backtrack your recent actions using one of several
methods.
Undo a Single Action
The simplest method of backtracking is to use Undo on the Standard toolbar
or the
U command to undo a single action. Many commands include their
own
U (undo) option so that you can correct mistakes without leaving the
command. When you are creating lines and polylines, for example, enter
u
to undo the last segment.
Undo Several Actions at Once
Use the Mark option of
UNDO to mark an action as you work. You can then
use the Back option of
UNDO to undo all actions that occurred after the
marked action. Use the Begin and End options of
UNDO to undo actions
you've defined as a group.
You can also undo several actions at once with the Undo list on the Standard
toolbar.
Reverse the Effect of Undo
You can reverse the effect of a single
U or UNDO command by using REDO
immediately after using
U or UNDO.
You can also redo several actions at once with the Redo list on the Standard
toolbar.
Erase Objects
You can erase any object that you draw. If you accidentally erase the wrong
object, you can use the
UNDO command or the OOPS command to restore it.
For more information, see “Remove Objects” on page 371.
Cancel a Command
You can cancel a command without completing it by pressing
ESC. To change
the cancel key assignment, clear the Windows Standard Accelerator Keys
option in the Options dialog box, User Preferences tab.