monitor will print the received events for:
UDEV - the event which udev sends out after rule processing

UDEV  [1268341988.126130] add      /devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5.3 (usb)
UDEV_LOG=3
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5.3
SUBSYSTEM=usb
DEVNAME=/dev/bus/usb/002/021
DEVTYPE=usb_device
PRODUCT=781/74c1/9820
TYPE=0/0/0
BUSNUM=002
DEVNUM=021
SEQNUM=2043
ID_VENDOR=SanDisk
ID_VENDOR_ENC=SanDisk
ID_VENDOR_ID=0781
ID_MODEL=SanDisk_Sansa_Fuze
ID_MODEL_ENC=SanDisk\x20Sansa\x20Fuze
ID_MODEL_ID=74c1
ID_REVISION=9820
ID_SERIAL=SanDisk_SanDisk_Sansa_Fuze_740EF7120419B5910000000000000000
ID_SERIAL_SHORT=740EF7120419B5910000000000000000
ID_BUS=usb
ID_USB_INTERFACES=:080650:
MAJOR=189
MINOR=148
DEVLINKS=/dev/char/189:148

UDEV  [1268341988.130299] add      /devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5.3/2-5.3:1.0 (usb)
UDEV_LOG=3
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5.3/2-5.3:1.0
SUBSYSTEM=usb
DEVTYPE=usb_interface
PRODUCT=781/74c1/9820
TYPE=0/0/0
INTERFACE=8/6/80
MODALIAS=usb:v0781p74C1d9820dc00dsc00dp00ic08isc06ip50
SEQNUM=2044

UDEV  [1268341988.130987] add      /devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5.3/2-5.3:1.0/host13 (scsi)
UDEV_LOG=3
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5.3/2-5.3:1.0/host13
SUBSYSTEM=scsi
DEVTYPE=scsi_host
SEQNUM=2045

UDEV  [1268341988.131601] add      /devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5.3/2-5.3:1.0/host13/scsi_host/host13 (scsi_host)
UDEV_LOG=3
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5.3/2-5.3:1.0/host13/scsi_host/host13
SUBSYSTEM=scsi_host
SEQNUM=2046

UDEV  [1268341993.133124] add      /devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5.3/2-5.3:1.0/host13/target13:0:0 (scsi)
UDEV_LOG=3
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5.3/2-5.3:1.0/host13/target13:0:0
SUBSYSTEM=scsi
DEVTYPE=scsi_target
SEQNUM=2047

UDEV  [1268341993.133902] add      /devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5.3/2-5.3:1.0/host13/target13:0:0/13:0:0:0 (scsi)
UDEV_LOG=3
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5.3/2-5.3:1.0/host13/target13:0:0/13:0:0:0
SUBSYSTEM=scsi
DEVTYPE=scsi_device
MODALIAS=scsi:t-0x00
SEQNUM=2048

UDEV  [1268341993.133963] add      /devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5.3/2-5.3:1.0/host13/target13:0:0/13:0:0:1 (scsi)
UDEV_LOG=3
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5.3/2-5.3:1.0/host13/target13:0:0/13:0:0:1
SUBSYSTEM=scsi
DEVTYPE=scsi_device
MODALIAS=scsi:t-0x00
SEQNUM=2052

UDEV  [1268341993.134400] add      /devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5.3/2-5.3:1.0/host13/target13:0:0/13:0:0:0/scsi_disk/13:0:0:0 (scsi_disk)
UDEV_LOG=3
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5.3/2-5.3:1.0/host13/target13:0:0/13:0:0:0/scsi_disk/13:0:0:0
SUBSYSTEM=scsi_disk
SEQNUM=2049

UDEV  [1268341993.134857] add      /devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5.3/2-5.3:1.0/host13/target13:0:0/13:0:0:1/scsi_disk/13:0:0:1 (scsi_disk)
UDEV_LOG=3
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5.3/2-5.3:1.0/host13/target13:0:0/13:0:0:1/scsi_disk/13:0:0:1
SUBSYSTEM=scsi_disk
SEQNUM=2053

UDEV  [1268341993.135166] add      /devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5.3/2-5.3:1.0/host13/target13:0:0/13:0:0:0/scsi_device/13:0:0:0 (scsi_device)
UDEV_LOG=3
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5.3/2-5.3:1.0/host13/target13:0:0/13:0:0:0/scsi_device/13:0:0:0
SUBSYSTEM=scsi_device
SEQNUM=2050

UDEV  [1268341993.135557] add      /devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5.3/2-5.3:1.0/host13/target13:0:0/13:0:0:1/scsi_device/13:0:0:1 (scsi_device)
UDEV_LOG=3
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5.3/2-5.3:1.0/host13/target13:0:0/13:0:0:1/scsi_device/13:0:0:1
SUBSYSTEM=scsi_device
SEQNUM=2054

UDEV  [1268341993.136038] add      /devices/virtual/bdi/8:176 (bdi)
UDEV_LOG=3
ACTION=add
DEVPATH=/devices/virtual/bdi/8:176
SUBSYSTEM=bdi
SEQNUM=2057

UDEV  [1268341993.136060] add      /devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5.3/2-5.3:1.0/host13/target13:0:0/13:0:0:1/scsi_generic/sg12 (scsi_generic)
UDEV_LOG=3
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5.3/2-5.3:1.0/host13/target13:0:0/13:0:0:1/scsi_generic/sg12
SUBSYSTEM=scsi_generic
DEVNAME=/dev/sg12
SEQNUM=2055
MAJOR=21
MINOR=12
DEVLINKS=/dev/char/21:12

UDEV  [1268341993.139342] add      /devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5.3/2-5.3:1.0/host13/target13:0:0/13:0:0:0/scsi_generic/sg11 (scsi_generic)
UDEV_LOG=3
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5.3/2-5.3:1.0/host13/target13:0:0/13:0:0:0/scsi_generic/sg11
SUBSYSTEM=scsi_generic
DEVNAME=/dev/sg11
SEQNUM=2051
MAJOR=21
MINOR=11
DEVLINKS=/dev/char/21:11

UDEV  [1268341993.140759] change   /devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5.3/2-5.3:1.0/host13/target13:0:0/13:0:0:0 (scsi)
UDEV_LOG=3
ACTION=change
DEVPATH=/devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5.3/2-5.3:1.0/host13/target13:0:0/13:0:0:0
SUBSYSTEM=scsi
SDEV_MEDIA_CHANGE=1
DEVTYPE=scsi_device
DRIVER=sd
MODALIAS=scsi:t-0x00
SEQNUM=2058

UDEV  [1268341993.149699] add      /devices/virtual/bdi/8:160 (bdi)
UDEV_LOG=3
ACTION=add
DEVPATH=/devices/virtual/bdi/8:160
SUBSYSTEM=bdi
SEQNUM=2060

UDEV  [1268341993.192980] add      /devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5.3/2-5.3:1.0/host13/target13:0:0/13:0:0:1/block/sdl (block)
UDEV_LOG=3
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5.3/2-5.3:1.0/host13/target13:0:0/13:0:0:1/block/sdl
SUBSYSTEM=block
DEVNAME=/dev/sdl
DEVTYPE=disk
SEQNUM=2056
ID_VENDOR=SanDisk
ID_VENDOR_ENC=SanDisk\x20
ID_VENDOR_ID=0781
ID_MODEL=Sansa_Fuze_8GB
ID_MODEL_ENC=Sansa\x20Fuze\x208GB\x20\x20
ID_MODEL_ID=74c1
ID_REVISION=v01.
ID_SERIAL=SanDisk_Sansa_Fuze_8GB_740EF7120419B5910000000000000000-0:1
ID_SERIAL_SHORT=740EF7120419B5910000000000000000
ID_TYPE=disk
ID_INSTANCE=0:1
ID_BUS=usb
ID_USB_INTERFACES=:080650:
ID_USB_INTERFACE_NUM=00
ID_USB_DRIVER=usb-storage
ID_PATH=pci-0000:00:1d.7-usb-0:5.3:1.0-scsi-0:0:0:1
UDISKS_PRESENTATION_NOPOLICY=0
ID_MEDIA_PLAYER=sandisk-7432_7433_7434_7435_74c0_74c1_74c2_74c3
MAJOR=8
MINOR=176
DEVLINKS=/dev/block/8:176 /dev/disk/by-id/usb-SanDisk_Sansa_Fuze_8GB_740EF7120419B5910000000000000000-0:1 /dev/disk/by-path/pci-0000:00:1d.7-usb-0:5.3:1.0-scsi-0:0:0:1

UDEV  [1268341993.899285] add      /devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5.3/2-5.3:1.0/host13/target13:0:0/13:0:0:0/block/sdk (block)
UDEV_LOG=3
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5.3/2-5.3:1.0/host13/target13:0:0/13:0:0:0/block/sdk
SUBSYSTEM=block
DEVNAME=/dev/sdk
DEVTYPE=disk
SEQNUM=2059
ID_VENDOR=SanDisk
ID_VENDOR_ENC=SanDisk\x20
ID_VENDOR_ID=0781
ID_MODEL=Sansa_Fuze_8GB
ID_MODEL_ENC=Sansa\x20Fuze\x208GB\x20\x20
ID_MODEL_ID=74c1
ID_REVISION=v01.
ID_SERIAL=SanDisk_Sansa_Fuze_8GB_740EF7120419B5910000000000000000-0:0
ID_SERIAL_SHORT=740EF7120419B5910000000000000000
ID_TYPE=disk
ID_INSTANCE=0:0
ID_BUS=usb
ID_USB_INTERFACES=:080650:
ID_USB_INTERFACE_NUM=00
ID_USB_DRIVER=usb-storage
ID_PATH=pci-0000:00:1d.7-usb-0:5.3:1.0-scsi-0:0:0:0
ID_FS_UUID=0123-4567
ID_FS_UUID_ENC=0123-4567
ID_FS_VERSION=FAT32
ID_FS_TYPE=vfat
ID_FS_USAGE=filesystem
UDISKS_PRESENTATION_NOPOLICY=0
UDISKS_PARTITION_TABLE=1
UDISKS_PARTITION_TABLE_SCHEME=mbr
UDISKS_PARTITION_TABLE_COUNT=0
ID_MEDIA_PLAYER=sandisk-7432_7433_7434_7435_74c0_74c1_74c2_74c3
MAJOR=8
MINOR=160
DEVLINKS=/dev/block/8:160 /dev/disk/by-id/usb-SanDisk_Sansa_Fuze_8GB_740EF7120419B5910000000000000000-0:0 /dev/disk/by-path/pci-0000:00:1d.7-usb-0:5.3:1.0-scsi-0:0:0:0 /dev/disk/by-uuid/0123-4567