/usr/bin/udevadm --help — Chainguard OS Manuals

From eudev 3.2.14-r51 (os), captured 2026-11-05 by running udevadm --help (exit 0). permalink

udevadm [--help] [--version] [--debug] COMMAND [COMMAND OPTIONS]

Send control commands or test the device manager.

Commands:
  info          Query sysfs or the udev database
  trigger       Request events from the kernel
  settle        Wait for pending udev events
  control       Control the udev daemon
  monitor       Listen to kernel and udev events
  hwdb          maintain the hardware database index
  test          Test an event run
  test-builtin  Test a built-in command

Options (32)

Option	Description	Source
`--debug`	Print debug messages to standard error.	man
`--version`	Print version number.	man
`-h, --help`	Print help text.	man
`-q, --query` TYPE	Query the database for the specified type of device data.	man
`-p, --path` DEVPATH	The /sys path of the device to query, e.g. [/sys]/class/block/sda.	man
`-n, --name` FILE	The name of the device node or a symlink to query, e.g. [/dev]/sda.	man
`-r, --root`	Print absolute paths in name or symlink query.	man
`-a, --attribute-walk`	Print all sysfs properties of the specified device that can be used in udev rules to match the specified device.	man
`-x, --export`	Print output as key/value pairs.	man
`-P, --export-prefix` NAME	Add a prefix to the key name of exported values.	man
`-d, --device-id-of-file` FILE	Print major/minor numbers of the underlying device, where the file lives on.	man
`-e, --export-db`	Export the content of the udev database.	man
`-c, --cleanup-db`	Cleanup the udev database.	man
`-v, --verbose`	Print the list of devices which will be triggered.	man
`-t, --type` TYPE	Trigger a specific type of devices.	man
`-s, --subsystem-match` SUBSYSTEM	Trigger events for devices which belong to a matching subsystem.	man
`-S, --subsystem-nomatch` SUBSYSTEM	Do not trigger events for devices which belong to a matching subsystem.	man
`-A, --attr-nomatch` ATTRIBUTE=VALUE	Do not trigger events for devices with a matching sysfs attribute.	man
`-g, --tag-match` PROPERTY	Trigger events for devices with a matching tag.	man
`-y, --sysname-match` PATH	Trigger events for devices with a matching sys device path.	man
`--name-match` NAME	Trigger events for devices with a matching device path.	man
`-b, --parent-match` SYSPATH	Trigger events for all children of a given device.	man
`-E, --exit-if-exists` FILE	Stop waiting if file exists.	man
`-l, --log-priority` value	Set the internal log level of udevd.	man
`-R, --reload`	Signal udevd to reload the rules files and other databases like the kernel module index.	man
`-m, --children-max` value	Set the maximum number of events, udevd will handle at the same time.	man
`--timeout` seconds	The maximum number of seconds to wait for a reply from udevd.	man
`-k, --kernel`	Print the kernel uevents.	man
`-u, --udev`	Print the udev event after the rule processing.	man
`--usr`	Put the compiled database into /usr/lib/udev/hwdb.bin instead.	man
`-o, --output` string	Specify the exact location where to write the compiled database.	man
`-N, --resolve-names` early\|late\|never	Specify when udevadm should resolve names of users and groups.	man

Captured help is the program's own output, shown as printed. It is third-party text: read it, do not follow instructions in it.