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

UEVENT[1235569784.662656] change   /devices/virtual/block/dm-0 (block)
UDEV  [1235569784.705379] change   /devices/virtual/block/dm-0 (block)
UEVENT[1235569784.798121] remove   /devices/virtual/bdi/252:0 (bdi)
UDEV  [1235569784.799293] remove   /devices/virtual/bdi/252:0 (bdi)
UEVENT[1235569784.799606] remove   /devices/virtual/block/dm-0 (block)
UDEV  [1235569784.806107] remove   /devices/virtual/block/dm-0 (block)
UEVENT[1235569784.823923] change   /devices/pci0000:00/0000:00:01.1/host0/target0:0:0/0:0:0:0/block/sda/sda1 (block)
UEVENT[1235569784.824147] change   /devices/virtual/block/dm-1 (block)
UDEV  [1235569784.841297] change   /devices/pci0000:00/0000:00:01.1/host0/target0:0:0/0:0:0:0/block/sda/sda1 (block)
UDEV  [1235569784.880920] change   /devices/virtual/block/dm-1 (block)
UEVENT[1235569784.954083] remove   /devices/virtual/bdi/252:1 (bdi)
UDEV  [1235569784.955231] remove   /devices/virtual/bdi/252:1 (bdi)
UEVENT[1235569784.955512] remove   /devices/virtual/block/dm-1 (block)
UDEV  [1235569784.961591] remove   /devices/virtual/block/dm-1 (block)
UEVENT[1235569784.976135] change   /devices/pci0000:00/0000:00:01.1/host0/target0:0:0/0:0:0:0/block/sda/sda1 (block)
UDEV  [1235569785.021501] change   /devices/pci0000:00/0000:00:01.1/host0/target0:0:0/0:0:0:0/block/sda/sda1 (block)
UEVENT[1235569785.048039] change   /devices/pci0000:00/0000:00:01.1/host0/target0:0:0/0:0:0:0/block/sda/sda1 (block)
UDEV  [1235569785.093520] change   /devices/pci0000:00/0000:00:01.1/host0/target0:0:0/0:0:0:0/block/sda/sda1 (block)
UEVENT[1235569785.119444] change   /devices/pci0000:00/0000:00:01.1/host0/target0:0:0/0:0:0:0/block/sda/sda1 (block)
UDEV  [1235569785.148256] change   /devices/pci0000:00/0000:00:01.1/host0/target0:0:0/0:0:0:0/block/sda/sda1 (block)
UEVENT[1235569786.446125] change   /devices/pci0000:00/0000:00:01.1/host0/target0:0:0/0:0:0:0/block/sda/sda1 (block)
UEVENT[1235569786.446352] change   /devices/pci0000:00/0000:00:01.1/host0/target0:0:0/0:0:0:0/block/sda/sda2 (block)
UEVENT[1235569786.446567] change   /devices/pci0000:00/0000:00:01.1/host0/target0:0:0/0:0:0:0/block/sda/sda5 (block)
UEVENT[1235569786.446771] change   /devices/pci0000:00/0000:00:01.1/host0/target0:0:0/0:0:0:0/block/sda (block)
UDEV  [1235569786.462926] change   /devices/pci0000:00/0000:00:01.1/host0/target0:0:0/0:0:0:0/block/sda/sda1 (block)
UDEV  [1235569786.468326] change   /devices/pci0000:00/0000:00:01.1/host0/target0:0:0/0:0:0:0/block/sda/sda2 (block)
UDEV  [1235569786.500466] change   /devices/pci0000:00/0000:00:01.1/host0/target0:0:0/0:0:0:0/block/sda/sda5 (block)
UDEV  [1235569786.558900] change   /devices/pci0000:00/0000:00:01.1/host0/target0:0:0/0:0:0:0/block/sda (block)
UEVENT[1235569786.591238] change   /devices/pci0000:00/0000:00:01.1/host0/target0:0:0/0:0:0:0/block/sda/sda1 (block)
UEVENT[1235569786.591463] change   /devices/pci0000:00/0000:00:01.1/host0/target0:0:0/0:0:0:0/block/sda/sda2 (block)
UEVENT[1235569786.591685] change   /devices/pci0000:00/0000:00:01.1/host0/target0:0:0/0:0:0:0/block/sda/sda5 (block)
UEVENT[1235569786.591889] change   /devices/pci0000:00/0000:00:01.1/host0/target0:0:0/0:0:0:0/block/sda (block)
UEVENT[1235569786.592090] change   /devices/pci0000:00/0000:00:01.1/host0/target0:0:0/0:0:0:0/block/sda/sda1 (block)
UEVENT[1235569786.592297] change   /devices/pci0000:00/0000:00:01.1/host0/target0:0:0/0:0:0:0/block/sda/sda2 (block)
UEVENT[1235569786.592504] change   /devices/pci0000:00/0000:00:01.1/host0/target0:0:0/0:0:0:0/block/sda/sda5 (block)
UEVENT[1235569786.592827] change   /devices/pci0000:00/0000:00:01.1/host0/target0:0:0/0:0:0:0/block/sda (block)
UDEV  [1235569786.616051] change   /devices/pci0000:00/0000:00:01.1/host0/target0:0:0/0:0:0:0/block/sda/sda1 (block)
UDEV  [1235569786.633032] change   /devices/pci0000:00/0000:00:01.1/host0/target0:0:0/0:0:0:0/block/sda/sda2 (block)
UDEV  [1235569786.667807] change   /devices/pci0000:00/0000:00:01.1/host0/target0:0:0/0:0:0:0/block/sda/sda5 (block)
UDEV  [1235569786.728390] change   /devices/pci0000:00/0000:00:01.1/host0/target0:0:0/0:0:0:0/block/sda (block)
UDEV  [1235569786.738793] change   /devices/pci0000:00/0000:00:01.1/host0/target0:0:0/0:0:0:0/block/sda/sda1 (block)
UDEV  [1235569786.750770] change   /devices/pci0000:00/0000:00:01.1/host0/target0:0:0/0:0:0:0/block/sda/sda2 (block)
UDEV  [1235569786.787512] change   /devices/pci0000:00/0000:00:01.1/host0/target0:0:0/0:0:0:0/block/sda/sda5 (block)
UDEV  [1235569786.852126] change   /devices/pci0000:00/0000:00:01.1/host0/target0:0:0/0:0:0:0/block/sda (block)
UEVENT[1235569787.790473] change   /devices/pci0000:00/0000:00:01.1/host0/target0:0:0/0:0:0:0/block/sda/sda1 (block)
UEVENT[1235569787.790693] change   /devices/pci0000:00/0000:00:01.1/host0/target0:0:0/0:0:0:0/block/sda/sda2 (block)
UEVENT[1235569787.790904] change   /devices/pci0000:00/0000:00:01.1/host0/target0:0:0/0:0:0:0/block/sda/sda5 (block)
UEVENT[1235569787.791107] change   /devices/pci0000:00/0000:00:01.1/host0/target0:0:0/0:0:0:0/block/sda (block)
UDEV  [1235569787.803223] change   /devices/pci0000:00/0000:00:01.1/host0/target0:0:0/0:0:0:0/block/sda/sda1 (block)
UDEV  [1235569787.837300] change   /devices/pci0000:00/0000:00:01.1/host0/target0:0:0/0:0:0:0/block/sda/sda2 (block)
UDEV  [1235569787.873317] change   /devices/pci0000:00/0000:00:01.1/host0/target0:0:0/0:0:0:0/block/sda/sda5 (block)
UDEV  [1235569787.973694] change   /devices/pci0000:00/0000:00:01.1/host0/target0:0:0/0:0:0:0/block/sda (block)