How to use NSMetadataQuery in command line

gistfile1.txt

let query = NSMetadataQuery();
query.searchScopes = ["/work/books"]
query.predicate = NSPredicate(format: "kMDItemFSName like %@", "NSHipster - Cocoa & Swift.pdf")
NotificationCenter.default.addObserver(forName: NSNotification.Name.NSMetadataQueryDidFinishGathering, object: query, queue: nil) { (_) in
    print("count = \(query.resultCount)")
    if let items = query.results as? [NSMetadataItem]{
        for item in items{
            if let path = item.value(forKey: NSMetadataItemPathKey) as? String{
                 print(path)
            }
           
        }
    }
}
query.start();
RunLoop.current.run();