The OVERKILL command, which is used to delete duplicate objects, removes duplicate or overlapping lines, arcs, polylines, etc.
Enter OVERKILL and press Enter key
After executing the command, we are prompted to select an object, as shown in the following picture,
After selecting an object, the Overkill dialog box will pop up, as shown in the following picture,
To keep the default settings, just click OK.
We can also customize the settings to control the process. For example, we can check the “Ignore Layers” box, then we can delete overlapping lines, even if they are not on the same layer.
Then click OK to continue.
Then the command line will show how many objects/duplicates are deleted, as shown in the following picture,