sh screens # udevcontrol reload_rules
sh screens # udevmonitor
udevmonitor will print the received events for:
UDEV the event which udev sends out after rule processing
UEVENT the kernel uevent

UEVENT[1194973450.948221] add      /devices/pci0000:00/0000:00:02.1/usb3/3-3 (usb)
UEVENT[1194973450.948296] add      /devices/pci0000:00/0000:00:02.1/usb3/3-3/usb_endpoint/usbdev3.9_ep00 (usb_endpoint)
UEVENT[1194973450.948307] add      /devices/pci0000:00/0000:00:02.1/usb3/3-3/3-3:1.0 (usb)
UEVENT[1194973450.948318] add      /slab/:0000288 (slab)
UEVENT[1194973450.948327] add      /class/scsi_host/host10 (scsi_host)
UEVENT[1194973450.948336] add      /devices/pci0000:00/0000:00:02.1/usb3/3-3/3-3:1.0/usb_endpoint/usbdev3.9_ep81 (usb_endpoint)
UEVENT[1194973450.948346] add      /devices/pci0000:00/0000:00:02.1/usb3/3-3/3-3:1.0/usb_endpoint/usbdev3.9_ep01 (usb_endpoint)
UDEV  [1194973450.971595] add      /devices/pci0000:00/0000:00:02.1/usb3/3-3 (usb)
UDEV  [1194973450.972655] add      /slab/:0000288 (slab)
UDEV  [1194973451.004962] add      /devices/pci0000:00/0000:00:02.1/usb3/3-3/usb_endpoint/usbdev3.9_ep00 (usb_endpoint)
UDEV  [1194973451.136318] add      /devices/pci0000:00/0000:00:02.1/usb3/3-3/3-3:1.0 (usb)
UDEV  [1194973451.138342] add      /class/scsi_host/host10 (scsi_host)
UDEV  [1194973451.169859] add      /devices/pci0000:00/0000:00:02.1/usb3/3-3/3-3:1.0/usb_endpoint/usbdev3.9_ep81 (usb_endpoint)
UDEV  [1194973451.185691] add      /devices/pci0000:00/0000:00:02.1/usb3/3-3/3-3:1.0/usb_endpoint/usbdev3.9_ep01 (usb_endpoint)
UEVENT[1194973455.957555] add      /devices/pci0000:00/0000:00:02.1/usb3/3-3/3-3:1.0/host10/target10:0:0/10:0:0:0 (scsi)
UEVENT[1194973455.957600] add      /class/scsi_device/10:0:0:0 (scsi_device)
UDEV  [1194973456.077092] add      /devices/pci0000:00/0000:00:02.1/usb3/3-3/3-3:1.0/host10/target10:0:0/10:0:0:0 (scsi)
UDEV  [1194973456.279396] add      /class/scsi_device/10:0:0:0 (scsi_device)