OOPS does exactly what you think it does, it fixes your mistake (as long as it’s a delete) no matter how far back it was. Instead of using CTRL-Z, OOPS undoes your last erase command without affecting any work you have done since then
Make Mistakes
Don’t be afraid to explore AutoCAD and make mistakes. The more mistakes you make, the better you will become at using the software.
AutoCAD offers some more options to correct errors such as:
• UNDO (or U) reverses the effect of commands. If you specify the number of preceding operations to Undo, you can avoid entering the command multiple times.
• ERASE removes selected objects from a drawing.
• OOPS restores objects erased by the last ERASE command.
• PURGE removes unused items, such as block definitions and layers, from the drawing.
• OVERKILL Removes duplicate or overlapping lines, arcs, and polylines – and combines partially overlapping or contiguous ones.
