NSURL* url = [NSURL fileURLWithPath:[@"~/Desktop/test.txt" stringByExpandingTildeInPath]];
    dispatch_queue_t observerQueue = dispatch_queue_create("filesystem-observer-queue", 0);
    int fileDescriptor = open([url fileSystemRepresentation], O_EVTONLY);
    dispatch_source_vnode_flags_t eventMask = DISPATCH_VNODE_DELETE|DISPATCH_VNODE_RENAME;
    dispatch_source_t fileSystemSource = dispatch_source_create(DISPATCH_SOURCE_TYPE_VNODE, fileDescriptor, eventMask, observerQueue);
    dispatch_source_set_event_handler(fileSystemSource, ^{
        dispatch_source_vnode_flags_t eventSourceFlag = dispatch_source_get_data(fileSystemSource);
        if(eventSourceFlag & DISPATCH_VNODE_DELETE)
        {
            NSLog(@"delete");
            dispatch_source_cancel(fileSystemSource);
        }
        else if(eventSourceFlag & DISPATCH_VNODE_RENAME)
        {
             NSLog(@"rename");
        }
        NSLog(@"Change at %@ of type %lu", url, eventSourceFlag);
    });
    dispatch_source_set_cancel_handler(fileSystemSource, ^{
        close(fileDescriptor);
    });
    dispatch_resume(fileSystemSource);