1, the concept is different: the cleaning command of pu in CAD software is PURGE, and the shortcut key is PU. It is mainly used to delete unused named items in drawings. The shortcut command for eliminating duplicate lines in CAD is OV, AU(AUto), and the effect is equivalent to direct clicking.
2. Different full names: the shortcut key of CAD cleaning command is PURGE, which can be abbreviated as PU, and the commands OVERKILL (shortcut key: OV) and AUtomatic can be abbreviated as Au.