root@jan /etc/udev/rules.d # udevmonitor 
udevmonitor will print the received events for:
UDEV the event which udev sends out after rule processing
UEVENT the kernel uevent

UEVENT[1194889947.898952] remove   /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3/3-2.7.3:1.0/usb_endpoint/usbdev3.28_ep81 (usb_endpoint)
UEVENT[1194889947.899970] remove   /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3/3-2.7.3:1.0/input/input30/event16 (input)
UEVENT[1194889947.900711] remove   /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3/3-2.7.3:1.0/input/input30 (input)
UEVENT[1194889947.901096] remove   /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3/3-2.7.3:1.0 (usb)
UEVENT[1194889947.901445] remove   /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3/3-2.7.3:1.1/usb_endpoint/usbdev3.28_ep82 (usb_endpoint)
UEVENT[1194889947.902453] remove   /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3/3-2.7.3:1.1/input/input31/event17 (input)
UEVENT[1194889947.903198] remove   /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3/3-2.7.3:1.1/input/input31 (input)
UEVENT[1194889947.903573] remove   /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3/3-2.7.3:1.1 (usb)
UEVENT[1194889947.903965] remove   /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3/usb_device/usbdev3.28 (usb_device)
UEVENT[1194889947.904621] remove   /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3/usb_endpoint/usbdev3.28_ep00 (usb_endpoint)
UEVENT[1194889947.905475] remove   /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3 (usb)
UEVENT[1194889947.905897] remove   /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7:1.0/usb_endpoint/usbdev3.27_ep81 (usb_endpoint)
UEVENT[1194889947.906572] remove   /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7:1.0 (usb)
UEVENT[1194889947.906724] remove   /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/usb_device/usbdev3.27 (usb_device)
UEVENT[1194889947.907119] remove   /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/usb_endpoint/usbdev3.27_ep00 (usb_endpoint)
UEVENT[1194889947.907793] remove   /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7 (usb)
UDEV  [1194889947.909933] remove   /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3/3-2.7.3:1.0/usb_endpoint/usbdev3.28_ep81 (usb_endpoint)
UDEV  [1194889947.911345] remove   /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3/3-2.7.3:1.0/input/input30/event16 (input)
UDEV  [1194889947.912334] remove   /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3/3-2.7.3:1.1/usb_endpoint/usbdev3.28_ep82 (usb_endpoint)
UDEV  [1194889947.913631] remove   /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3/3-2.7.3:1.1/input/input31/event17 (input)
UDEV  [1194889947.916426] remove   /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3/usb_endpoint/usbdev3.28_ep00 (usb_endpoint)
UDEV  [1194889947.953131] remove   /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7:1.0/usb_endpoint/usbdev3.27_ep81 (usb_endpoint)
UDEV  [1194889947.954588] remove   /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/usb_device/usbdev3.27 (usb_device)
UDEV  [1194889947.956047] remove   /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/usb_endpoint/usbdev3.27_ep00 (usb_endpoint)
UDEV  [1194889947.956689] remove   /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3/usb_device/usbdev3.28 (usb_device)
UDEV  [1194889947.962003] remove   /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3/3-2.7.3:1.1/input/input31 (input)
UDEV  [1194889947.967834] remove   /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7:1.0 (usb)
UDEV  [1194889947.968972] remove   /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3/3-2.7.3:1.0/input/input30 (input)
UDEV  [1194889947.970117] remove   /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3/3-2.7.3:1.1 (usb)
UDEV  [1194889947.975491] remove   /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3/3-2.7.3:1.0 (usb)
UEVENT[1194889957.397888] add      /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7 (usb)
UEVENT[1194889957.399058] add      /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/usb_endpoint/usbdev3.29_ep00 (usb_endpoint)
UEVENT[1194889957.399985] add      /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7:1.0 (usb)
UDEV  [1194889957.437323] add      /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7 (usb)
UDEV  [1194889957.440208] add      /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/usb_endpoint/usbdev3.29_ep00 (usb_endpoint)
UEVENT[1194889957.505008] add      /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7:1.0/usb_endpoint/usbdev3.29_ep81 (usb_endpoint)
UEVENT[1194889957.505572] add      /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/usb_device/usbdev3.29 (usb_device)
UDEV  [1194889957.592249] add      /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7:1.0 (usb)
UDEV  [1194889957.603417] add      /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7:1.0/usb_endpoint/usbdev3.29_ep81 (usb_endpoint)
UDEV  [1194889957.650381] add      /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/usb_device/usbdev3.29 (usb_device)
UEVENT[1194889957.782416] add      /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3 (usb)
UEVENT[1194889957.783458] add      /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3/usb_endpoint/usbdev3.30_ep00 (usb_endpoint)
UEVENT[1194889957.784514] add      /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3/3-2.7.3:1.0 (usb)
UEVENT[1194889957.788424] add      /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3/3-2.7.3:1.0/input/input32 (input)
UEVENT[1194889957.789043] add      /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3/3-2.7.3:1.0/input/input32/event16 (input)
UEVENT[1194889957.789693] add      /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3/3-2.7.3:1.0/usb_endpoint/usbdev3.30_ep81 (usb_endpoint)
UEVENT[1194889957.790056] add      /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3/3-2.7.3:1.1 (usb)
UEVENT[1194889957.799601] add      /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3/3-2.7.3:1.1/input/input33 (input)
UEVENT[1194889957.802372] add      /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3/3-2.7.3:1.1/input/input33/event17 (input)
UEVENT[1194889957.803000] add      /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3/3-2.7.3:1.1/usb_endpoint/usbdev3.30_ep82 (usb_endpoint)
UEVENT[1194889957.803384] add      /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3/usb_device/usbdev3.30 (usb_device)
UDEV  [1194889957.811993] add      /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3 (usb)
UDEV  [1194889957.820782] add      /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3/usb_endpoint/usbdev3.30_ep00 (usb_endpoint)
UDEV  [1194889958.116443] add      /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3/3-2.7.3:1.1 (usb)
UDEV  [1194889958.123241] add      /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3/3-2.7.3:1.1/usb_endpoint/usbdev3.30_ep82 (usb_endpoint)
UDEV  [1194889958.150620] add      /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3/3-2.7.3:1.0 (usb)
UDEV  [1194889958.156920] add      /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3/3-2.7.3:1.0/usb_endpoint/usbdev3.30_ep81 (usb_endpoint)
UDEV  [1194889958.159073] add      /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3/usb_device/usbdev3.30 (usb_device)
UDEV  [1194889958.315672] add      /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3/3-2.7.3:1.1/input/input33 (input)
UDEV  [1194889958.361619] add      /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3/3-2.7.3:1.0/input/input32 (input)
UDEV  [1194889958.420285] add      /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3/3-2.7.3:1.1/input/input33/event17 (input)
UDEV  [1194889958.443978] add      /devices/pci0000:00/0000:00:13.2/usb3/3-2/3-2.7/3-2.7.3/3-2.7.3:1.0/input/input32/event16 (input)