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

UDEV  [1196280279.115519] add      /devices/pci0000:00/0000:00:1f.2/usb1/1-1 (usb)
UDEV_LOG=3
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:1f.2/usb1/1-1
SUBSYSTEM=usb
SEQNUM=25205
MAJOR=189
MINOR=43
DEVTYPE=usb_device
PHYSDEVBUS=usb
DEVICE=/proc/bus/usb/001/044
PRODUCT=66f/8000/1001
TYPE=0/0/0
BUSNUM=001
DEVNUM=044
UDEVD_EVENT=1
DEVNAME=/dev/1-1

UDEV  [1196280279.115634] add      /class/usb_endpoint/usbdev1.44_ep00 (usb_endpoint)
UDEV_LOG=3
ACTION=add
DEVPATH=/class/usb_endpoint/usbdev1.44_ep00
SUBSYSTEM=usb_endpoint
SEQNUM=25206
MAJOR=254
MINOR=4
PHYSDEVPATH=/devices/pci0000:00/0000:00:1f.2/usb1/1-1
PHYSDEVBUS=usb
PHYSDEVDRIVER=usb
UDEVD_EVENT=1
DEVNAME=/dev/usbdev1.44_ep00

UEVENT[1196280279.115661] add      /devices/pci0000:00/0000:00:1f.2/usb1/1-1/1-1:1.0 (usb)
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:1f.2/usb1/1-1/1-1:1.0
SUBSYSTEM=usb
SEQNUM=25207
DEVTYPE=usb_interface
PHYSDEVBUS=usb
DEVICE=/proc/bus/usb/001/044
PRODUCT=66f/8000/1001
TYPE=0/0/0
INTERFACE=8/6/80
MODALIAS=usb:v066Fp8000d1001dc00dsc00dp00ic08isc06ip50

UEVENT[1196280279.116101] add      /class/scsi_host/host42 (scsi_host)
ACTION=add
DEVPATH=/class/scsi_host/host42
SUBSYSTEM=scsi_host
SEQNUM=25208
PHYSDEVPATH=/devices/pci0000:00/0000:00:1f.2/usb1/1-1/1-1:1.0/host42

UEVENT[1196280279.116128] add      /class/usb_endpoint/usbdev1.44_ep81 (usb_endpoint)
ACTION=add
DEVPATH=/class/usb_endpoint/usbdev1.44_ep81
SUBSYSTEM=usb_endpoint
SEQNUM=25209
MAJOR=254
MINOR=5
PHYSDEVPATH=/devices/pci0000:00/0000:00:1f.2/usb1/1-1/1-1:1.0
PHYSDEVBUS=usb
PHYSDEVDRIVER=usb-storage

UEVENT[1196280279.116147] add      /class/usb_endpoint/usbdev1.44_ep02 (usb_endpoint)
ACTION=add
DEVPATH=/class/usb_endpoint/usbdev1.44_ep02
SUBSYSTEM=usb_endpoint
SEQNUM=25210
MAJOR=254
MINOR=6
PHYSDEVPATH=/devices/pci0000:00/0000:00:1f.2/usb1/1-1/1-1:1.0
PHYSDEVBUS=usb
PHYSDEVDRIVER=usb-storage

UEVENT[1196280279.116164] add      /class/usb_device/usbdev1.44 (usb_device)
ACTION=add
DEVPATH=/class/usb_device/usbdev1.44
SUBSYSTEM=usb_device
SEQNUM=25211
MAJOR=189
MINOR=43
PHYSDEVPATH=/devices/pci0000:00/0000:00:1f.2/usb1/1-1
PHYSDEVBUS=usb
PHYSDEVDRIVER=usb

UDEV  [1196280279.235099] add      /devices/pci0000:00/0000:00:1f.2/usb1/1-1/1-1:1.0 (usb)
UDEV_LOG=3
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:1f.2/usb1/1-1/1-1:1.0
SUBSYSTEM=usb
SEQNUM=25207
DEVTYPE=usb_interface
PHYSDEVBUS=usb
DEVICE=/proc/bus/usb/001/044
PRODUCT=66f/8000/1001
TYPE=0/0/0
INTERFACE=8/6/80
MODALIAS=usb:v066Fp8000d1001dc00dsc00dp00ic08isc06ip50
UDEVD_EVENT=1

UDEV  [1196280279.235170] add      /class/scsi_host/host42 (scsi_host)
UDEV_LOG=3
ACTION=add
DEVPATH=/class/scsi_host/host42
SUBSYSTEM=scsi_host
SEQNUM=25208
PHYSDEVPATH=/devices/pci0000:00/0000:00:1f.2/usb1/1-1/1-1:1.0/host42
UDEVD_EVENT=1

UDEV  [1196280279.248806] add      /class/usb_endpoint/usbdev1.44_ep81 (usb_endpoint)
UDEV_LOG=3
ACTION=add
DEVPATH=/class/usb_endpoint/usbdev1.44_ep81
SUBSYSTEM=usb_endpoint
SEQNUM=25209
MAJOR=254
MINOR=5
PHYSDEVPATH=/devices/pci0000:00/0000:00:1f.2/usb1/1-1/1-1:1.0
PHYSDEVBUS=usb
PHYSDEVDRIVER=usb-storage
UDEVD_EVENT=1
DEVNAME=/dev/usbdev1.44_ep81

UDEV  [1196280279.252188] add      /class/usb_endpoint/usbdev1.44_ep02 (usb_endpoint)
UDEV_LOG=3
ACTION=add
DEVPATH=/class/usb_endpoint/usbdev1.44_ep02
SUBSYSTEM=usb_endpoint
SEQNUM=25210
MAJOR=254
MINOR=6
PHYSDEVPATH=/devices/pci0000:00/0000:00:1f.2/usb1/1-1/1-1:1.0
PHYSDEVBUS=usb
PHYSDEVDRIVER=usb-storage
UDEVD_EVENT=1
DEVNAME=/dev/usbdev1.44_ep02

UDEV  [1196280279.338603] add      /class/usb_device/usbdev1.44 (usb_device)
UDEV_LOG=3
ACTION=add
DEVPATH=/class/usb_device/usbdev1.44
SUBSYSTEM=usb_device
SEQNUM=25211
MAJOR=189
MINOR=43
PHYSDEVPATH=/devices/pci0000:00/0000:00:1f.2/usb1/1-1
PHYSDEVBUS=usb
PHYSDEVDRIVER=usb
UDEVD_EVENT=1
USB_BUS=001
USB_DEV=044
DEVNAME=/dev/bus/usb/001/044

UEVENT[1196280283.989671] add      /devices/pci0000:00/0000:00:1f.2/usb1/1-1/1-1:1.0/host42/target42:0:0/42:0:0:0 (scsi)
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:1f.2/usb1/1-1/1-1:1.0/host42/target42:0:0/42:0:0:0
SUBSYSTEM=scsi
SEQNUM=25212
PHYSDEVBUS=scsi
MODALIAS=scsi:t-0x00

UEVENT[1196280283.989741] add      /class/scsi_disk/42:0:0:0 (scsi_disk)
ACTION=add
DEVPATH=/class/scsi_disk/42:0:0:0
SUBSYSTEM=scsi_disk
SEQNUM=25213
PHYSDEVPATH=/devices/pci0000:00/0000:00:1f.2/usb1/1-1/1-1:1.0/host42/target42:0:0/42:0:0:0
PHYSDEVBUS=scsi
PHYSDEVDRIVER=sd

UEVENT[1196280284.019472] add      /block/sdb (block)
ACTION=add
DEVPATH=/block/sdb
SUBSYSTEM=block
SEQNUM=25214
MINOR=16
MAJOR=8
PHYSDEVPATH=/devices/pci0000:00/0000:00:1f.2/usb1/1-1/1-1:1.0/host42/target42:0:0/42:0:0:0
PHYSDEVBUS=scsi
PHYSDEVDRIVER=sd

UEVENT[1196280284.019537] add      /block/sdb/sdb1 (block)
ACTION=add
DEVPATH=/block/sdb/sdb1
SUBSYSTEM=block
SEQNUM=25215
MINOR=17
MAJOR=8
PHYSDEVPATH=/devices/pci0000:00/0000:00:1f.2/usb1/1-1/1-1:1.0/host42/target42:0:0/42:0:0:0
PHYSDEVBUS=scsi
PHYSDEVDRIVER=sd

UEVENT[1196280284.019553] add      /class/scsi_device/42:0:0:0 (scsi_device)
ACTION=add
DEVPATH=/class/scsi_device/42:0:0:0
SUBSYSTEM=scsi_device
SEQNUM=25216
PHYSDEVPATH=/devices/pci0000:00/0000:00:1f.2/usb1/1-1/1-1:1.0/host42/target42:0:0/42:0:0:0
PHYSDEVBUS=scsi
PHYSDEVDRIVER=sd

UEVENT[1196280284.019591] add      /class/scsi_generic/sg2 (scsi_generic)
ACTION=add
DEVPATH=/class/scsi_generic/sg2
SUBSYSTEM=scsi_generic
SEQNUM=25217
MAJOR=21
MINOR=2
PHYSDEVPATH=/devices/pci0000:00/0000:00:1f.2/usb1/1-1/1-1:1.0/host42/target42:0:0/42:0:0:0
PHYSDEVBUS=scsi
PHYSDEVDRIVER=sd

UDEV  [1196280284.307198] add      /devices/pci0000:00/0000:00:1f.2/usb1/1-1/1-1:1.0/host42/target42:0:0/42:0:0:0 (scsi)
UDEV_LOG=3
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:1f.2/usb1/1-1/1-1:1.0/host42/target42:0:0/42:0:0:0
SUBSYSTEM=scsi
SEQNUM=25212
PHYSDEVBUS=scsi
MODALIAS=scsi:t-0x00
UDEVD_EVENT=1

UDEV  [1196280284.313441] add      /class/scsi_disk/42:0:0:0 (scsi_disk)
UDEV_LOG=3
ACTION=add
DEVPATH=/class/scsi_disk/42:0:0:0
SUBSYSTEM=scsi_disk
SEQNUM=25213
PHYSDEVPATH=/devices/pci0000:00/0000:00:1f.2/usb1/1-1/1-1:1.0/host42/target42:0:0/42:0:0:0
PHYSDEVBUS=scsi
PHYSDEVDRIVER=sd
UDEVD_EVENT=1

UDEV  [1196280284.399672] add      /class/scsi_device/42:0:0:0 (scsi_device)
UDEV_LOG=3
ACTION=add
DEVPATH=/class/scsi_device/42:0:0:0
SUBSYSTEM=scsi_device
SEQNUM=25216
PHYSDEVPATH=/devices/pci0000:00/0000:00:1f.2/usb1/1-1/1-1:1.0/host42/target42:0:0/42:0:0:0
PHYSDEVBUS=scsi
PHYSDEVDRIVER=sd
UDEVD_EVENT=1

UDEV  [1196280284.446503] add      /class/scsi_generic/sg2 (scsi_generic)
UDEV_LOG=3
ACTION=add
DEVPATH=/class/scsi_generic/sg2
SUBSYSTEM=scsi_generic
SEQNUM=25217
MAJOR=21
MINOR=2
PHYSDEVPATH=/devices/pci0000:00/0000:00:1f.2/usb1/1-1/1-1:1.0/host42/target42:0:0/42:0:0:0
PHYSDEVBUS=scsi
PHYSDEVDRIVER=sd
UDEVD_EVENT=1
DEVNAME=/dev/sg2

UDEV  [1196280284.632546] add      /block/sdb (block)
UDEV_LOG=3
ACTION=add
DEVPATH=/block/sdb
SUBSYSTEM=block
SEQNUM=25214
MINOR=16
MAJOR=8
PHYSDEVPATH=/devices/pci0000:00/0000:00:1f.2/usb1/1-1/1-1:1.0/host42/target42:0:0/42:0:0:0
PHYSDEVBUS=scsi
PHYSDEVDRIVER=sd
UDEVD_EVENT=1
DEVTYPE=disk
ID_VENDOR=SigmaTel
ID_MODEL=MSCN
ID_REVISION=0100
ID_SERIAL=SigmaTel_MSCN_23DE9158D4B28214-0:0
ID_SERIAL_SHORT=23DE9158D4B28214
ID_TYPE=disk
ID_INSTANCE=0:0
ID_BUS=usb
ID_PATH=pci-0000:00:1f.2-usb-0:1:1.0-scsi-0:0:0:0
DEVNAME=/dev/sdb
DEVLINKS=/dev/disk/by-id/usb-SigmaTel_MSCN_23DE9158D4B28214-0:0 /dev/disk/by-path/pci-0000:00:1f.2-usb-0:1:1.0-scsi-0:0:0:0

UDEV  [1196280284.913392] add      /block/sdb/sdb1 (block)
UDEV_LOG=3
ACTION=add
DEVPATH=/block/sdb/sdb1
SUBSYSTEM=block
SEQNUM=25215
MINOR=17
MAJOR=8
PHYSDEVPATH=/devices/pci0000:00/0000:00:1f.2/usb1/1-1/1-1:1.0/host42/target42:0:0/42:0:0:0
PHYSDEVBUS=scsi
PHYSDEVDRIVER=sd
UDEVD_EVENT=1
DEVTYPE=partition
ID_VENDOR=SigmaTel
ID_MODEL=MSCN
ID_REVISION=0100
ID_SERIAL=SigmaTel_MSCN_23DE9158D4B28214-0:0
ID_SERIAL_SHORT=23DE9158D4B28214
ID_TYPE=disk
ID_INSTANCE=0:0
ID_BUS=usb
ID_PATH=pci-0000:00:1f.2-usb-0:1:1.0-scsi-0:0:0:0
ID_FS_USAGE=filesystem
ID_FS_TYPE=vfat
ID_FS_VERSION=FAT16
ID_FS_UUID=
ID_FS_UUID_ENC=
ID_FS_LABEL=MSCN
ID_FS_LABEL_ENC=MSCN
ID_FS_LABEL_SAFE=MSCN
DEVNAME=/dev/sd