udevadm - is used to manage udev. It takes various subcommands, each of
which
performs a certain task to modify the behavior of the systemd-udevd daemon
and related components
To get help options
$ udevadm --help
$ udevadm info --help
$ udevadm trigger --help
$ udevadm settle --help
$ udevadm control --help
$ udevadm monitor --help
$ udevadm test --help
$ udevadm test-builtin --help
To query the Udev database for the device path of /dev/vda1
$ udevadm info --query=path --name=/dev/vda1
To query the device attributes from the udev database
$ udevadm info /dev/vda1
To query the Udev database for all device information for /dev/vda1
$ udevadm info --query=all --name=/dev/xvda
$ udevadm info --query=all --name=/dev/xvda1
To print all sysfs properties of /dev/vda1
$ udevadm info --attribute-walk --name=/dev/vda
$ udevadm info --attribute-walk --name=/dev/vda1
To Trigger all udev rules
$ sudo udevadm trigger
To Reload all udev rules
$ sudo udevadm control --reload-rules
To List attributes of a device
$ udevadm info --attribute-walk --path /dev/vda1
To Monitor all device events
$ udevadm monitor
To Print uevents sent out by the kernel
$ udevadm monitor --kernel
To Print device events after being processed by udev
$ udevadm monitor --udev
regards,
T.Dhanasekar