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udevadm

Linux udev device manager administration

TLDR

Monitor all device events
$ sudo udevadm monitor
Print uevents sent by the kernel
$ sudo udevadm monitor -k
Print device events after being processed by udev
$ sudo udevadm monitor -u
List attributes of a device
$ sudo udevadm info -a [/dev/sda]
Reload all udev rules
$ sudo udevadm control -R
Trigger all udev rules to run
$ sudo udevadm trigger
Test an event run by simulating device loading
$ sudo udevadm test [/dev/sda]

SYNOPSIS

udevadm [command] [options]

DESCRIPTION

udevadm is the Linux udev management tool for querying and controlling the udev device manager. It can monitor device events, query device attributes, reload rules, and trigger rule processing.The tool is essential for debugging udev rules, understanding device properties, and managing hot-plug device handling.

PARAMETERS

monitor

Monitor kernel uevents and udev events
info
Query device information
control
Control the udev daemon
trigger
Request device events from the kernel
settle
Wait for pending udev events
test
Simulate a udev event
-k, --kernel
Print kernel uevents
-u, --udev
Print udev events
-a, --attribute-walk
Show all device attributes
-R, --reload
Reload udev rules

INSTALL

sudo apt install udev
sudo apk add eudev
sudo zypper install udev
nix profile install nixpkgs#udev

CAVEATS

Requires root privileges for most operations. The test command simulates events without actually running them. Rule changes require control --reload to take effect. Part of the systemd/udev suite.

SEE ALSO