technician4@projectbox:~$ udevadm monitor
monitor will print the received events for:
UDEV - the event which udev sends out after rule processing
KERNEL - the kernel uevent

KERNEL[1302909080.938138] add      /devices/pci0000:00/0000:00:1d.2/usb8/8-2 (usb)
UDEV  [1302909080.940797] add      /devices/pci0000:00/0000:00:1d.2/usb8/8-2 (usb)
KERNEL[1302909080.945025] add      /devices/pci0000:00/0000:00:1d.2/usb8/8-2/8-2:1.0 (usb)
UDEV  [1302909080.945396] add      /devices/pci0000:00/0000:00:1d.2/usb8/8-2/8-2:1.0 (usb)
KERNEL[1302909080.946635] add      /devices/pci0000:00/0000:00:1d.2/usb8/8-2/8-2:1.0/ttyUSB0 (usb-serial)
UDEV  [1302909080.946813] add      /devices/pci0000:00/0000:00:1d.2/usb8/8-2/8-2:1.0/ttyUSB0 (usb-serial)
KERNEL[1302909080.947237] add      /devices/pci0000:00/0000:00:1d.2/usb8/8-2/8-2:1.0/ttyUSB0/tty/ttyUSB0 (tty)
UDEV  [1302909080.966388] add      /devices/pci0000:00/0000:00:1d.2/usb8/8-2/8-2:1.0/ttyUSB0/tty/ttyUSB0 (tty)