Returns the selector associated with the receiver for the specified command description.
- macOS 10.0+
A description for a script command, such as
move. Encapsulates the scriptability information for that command, such as its Objective-C selector, its argument names and types, and its return type (if any).
The selector from the receiver for the command specified by
command. Searches in the receiver first, then in any superclass. Returns
NULL if no matching selector is found.