At the Command prompt, deletes all objects on a layer and purges the layer. 
The following prompts are displayed. 
- Select object on layer to delete
 
- Specifies an object on a layer you want to delete. 
- Undo. Clears the previous selection. 
 
 
- Name
 
- 
Enter the name of a layer to delete. 
- ? . Lists the available layers.