Tipster Denise Inacio shows us a few tricks using the Oops command to clear up an area in your AutoCAD file.
"I find a lot of newer users don't even know Oops exists, but I use it in a several ways in addition to the obvious. First, if an object selection is difficult because there is geometry in close proximity that I don't want to select, I erase the obtrusive geometry (all in one set), I execute the desired command, and then I Oops the obtrusive geometry back into place. Simple, yet effective.
"The other scenario where I use Oops is when I need to switch the positions of Object Group A and Object Group B. I select Object Group A, move it into place on top of Object Group B, then use Erase/previous. Now I select Group B and move it into its new position, and lastly, I Oops back Group A. It may be nothing fancy, but I know a lot of people are surprised when they see it in action."
Notes from Cadalyst Tip Patrol: This tip is an excellent example of what we like to see here: It takes an existing AutoCAD command and uses it in a new and different way. The Oops command will restore that last object (or selection of objects) that were erased, but it only does so once, so use it with caution. It is meant as a safety net in the case you accidentally erased something, then executed other commands. You could use the Undo feature until you restore your objects, but that will undo any steps taken between the erase and now. Other methods would be to isolate layers, freeze layers, or use the Isolate Objects command introduced in AutoCAD 2011. Using the Oops command in this way is very efficient — just be careful!