Command: BLOCK?
Enter block name <Return to select>: Press ENTER to select an object
Select a block: Use an object selection method
Enter an entity type <Return for all>: Press ENTER to list all block definition objects
Usage Example:
Enter a block name or select an inserted block, and then specify an object type
(such as line or text) to search for. Or accept the default to list all objects in the definition.
Block name/<Return to select>: Enter furn01
Enter an entity type <Return for all>: Enter line
Press ESC to exit or any key to continue.
((0 . "BLOCK") (2 . "FURN01") (70 . 0) (10 0.0 0.0 0.0) (-2 . <Entity name: 1f30c10>)) ((-1 . <Entity name: 1f30c28>) (0 . "LINE") (5 . "F5") (100 . "AcDbEntity") (67 . 0) (8 . "0") (100 . "AcDbLine") (10 20.0346 22.2133 0.0) (11 4.19456 22.2133 0.0) (210 0.0 0.0 1.0))