##udevadm monitor
root@netrotten-desktop:~# udevadm monitor
monitor will print the received events for:
UDEV - the event which udev sends out after rule processing
KERNEL - the kernel uevent

KERNEL[1338572098.272692] add      /devices/pci0000:00/0000:00:07.0/0000:02:00.0/usb8/8-2 (usb)
KERNEL[1338572098.273130] add      /devices/pci0000:00/0000:00:07.0/0000:02:00.0/usb8/8-2/8-2:1.0 (usb)
KERNEL[1338572098.273207] add      /devices/pci0000:00/0000:00:07.0/0000:02:00.0/usb8/8-2/8-2:1.0/host15 (scsi)
KERNEL[1338572098.273227] add      /devices/pci0000:00/0000:00:07.0/0000:02:00.0/usb8/8-2/8-2:1.0/host15/scsi_host/host15 (scsi_host)
UDEV  [1338572098.279895] add      /devices/pci0000:00/0000:00:07.0/0000:02:00.0/usb8/8-2 (usb)
UDEV  [1338572098.280232] add      /devices/pci0000:00/0000:00:07.0/0000:02:00.0/usb8/8-2/8-2:1.0 (usb)
UDEV  [1338572098.280399] add      /devices/pci0000:00/0000:00:07.0/0000:02:00.0/usb8/8-2/8-2:1.0/host15 (scsi)
UDEV  [1338572098.280576] add      /devices/pci0000:00/0000:00:07.0/0000:02:00.0/usb8/8-2/8-2:1.0/host15/scsi_host/host15 (scsi_host)
KERNEL[1338572105.289313] add      /devices/pci0000:00/0000:00:07.0/0000:02:00.0/usb8/8-2/8-2:1.0/host15/target15:0:0 (scsi)
KERNEL[1338572105.289340] add      /devices/pci0000:00/0000:00:07.0/0000:02:00.0/usb8/8-2/8-2:1.0/host15/target15:0:0/15:0:0:0 (scsi)
KERNEL[1338572105.289349] add      /devices/pci0000:00/0000:00:07.0/0000:02:00.0/usb8/8-2/8-2:1.0/host15/target15:0:0/15:0:0:0/scsi_disk/15:0:0:0 (scsi_disk)
KERNEL[1338572105.289357] add      /devices/pci0000:00/0000:00:07.0/0000:02:00.0/usb8/8-2/8-2:1.0/host15/target15:0:0/15:0:0:0/scsi_device/15:0:0:0 (scsi_device)
KERNEL[1338572105.289428] add      /devices/pci0000:00/0000:00:07.0/0000:02:00.0/usb8/8-2/8-2:1.0/host15/target15:0:0/15:0:0:0/scsi_generic/sg2 (scsi_generic)
KERNEL[1338572105.289451] add      /devices/pci0000:00/0000:00:07.0/0000:02:00.0/usb8/8-2/8-2:1.0/host15/target15:0:0/15:0:0:0/bsg/15:0:0:0 (bsg)
UDEV  [1338572105.289585] add      /devices/pci0000:00/0000:00:07.0/0000:02:00.0/usb8/8-2/8-2:1.0/host15/target15:0:0 (scsi)
UDEV  [1338572105.289911] add      /devices/pci0000:00/0000:00:07.0/0000:02:00.0/usb8/8-2/8-2:1.0/host15/target15:0:0/15:0:0:0 (scsi)
UDEV  [1338572105.290216] add      /devices/pci0000:00/0000:00:07.0/0000:02:00.0/usb8/8-2/8-2:1.0/host15/target15:0:0/15:0:0:0/scsi_disk/15:0:0:0 (scsi_disk)
UDEV  [1338572105.290396] add      /devices/pci0000:00/0000:00:07.0/0000:02:00.0/usb8/8-2/8-2:1.0/host15/target15:0:0/15:0:0:0/scsi_device/15:0:0:0 (scsi_device)
UDEV  [1338572105.290620] add      /devices/pci0000:00/0000:00:07.0/0000:02:00.0/usb8/8-2/8-2:1.0/host15/target15:0:0/15:0:0:0/bsg/15:0:0:0 (bsg)
UDEV  [1338572105.290892] add      /devices/pci0000:00/0000:00:07.0/0000:02:00.0/usb8/8-2/8-2:1.0/host15/target15:0:0/15:0:0:0/scsi_generic/sg2 (scsi_generic)