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