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UDEVADM(8) | udevadm | UDEVADM(8) |
NAME¶
udevadm - udev management toolSYNOPSIS¶
udevadm
[ --debug] [--version] [--help]
udevadm
info options
udevadm
trigger [options]
udevadm
settle [options]
udevadm
control command
udevadm
monitor [options]
udevadm
test [options] devpath
udevadm
test-builtin [options] command
devpath
DESCRIPTION¶
udevadm expects a command and command specific options. It controls the runtime behavior of udev, requests kernel events, manages the event queue, and provides simple debugging mechanisms.OPTIONS¶
--debugPrint debug messages to stderr.
--version
Print version number.
--help
Print help text.
udevadm info options¶
Queries the udev database for device information stored in the udev database. It can also query the properties of a device from its sysfs representation to help creating udev rules that match this device. --query=typeQuery the database for specified type of
device data. It needs the --path or --name to identify the
specified device. Valid queries are: name, symlink, path,
property, all.
--path=devpath
The devpath of the device to query.
--name=file
The name of the device node or a symlink to
query
--root
The udev root directory: /dev. If used in
conjunction with a name or symlink query, the query returns the
absolute path including the root directory.
--run
The udev runtime directory: /run/udev.
--attribute-walk
Print all sysfs properties of the specified
device that can be used in udev rules to match the specified device. It prints
all devices along the chain, up to the root of sysfs that can be used in udev
rules.
--export
Print output as key/value pairs. Values are
enclosed in single quotes.
--export-prefix=name
Add a prefix to the key name of exported
values.
--device-id-of-file=file
Print major/minor numbers of the underlying
device, where the file lives on.
--export-db
Export the content of the udev database.
--cleanup-db
Cleanup the udev database.
--version
Print version.
--help
Print help text.
udevadm trigger [options]¶
Request device events from the kernel. Primarily used to replay events at system coldplug time. --verbosePrint the list of devices which will be
triggered.
--dry-run
Do not actually trigger the event.
--type=type
Trigger a specific type of devices. Valid
types are: devices, subsystems. The default value is
devices.
--action=action
Type of event to be triggered. The default
value is change.
--subsystem-match=subsystem
Trigger events for devices which belong to a
matching subsystem. This option can be specified multiple times and supports
shell style pattern matching.
--subsystem-nomatch=subsystem
Do not trigger events for devices which belong
to a matching subsystem. This option can be specified multiple times and
supports shell style pattern matching.
--attr-match=attribute=value
Trigger events for devices with a matching
sysfs attribute. If a value is specified along with the attribute name, the
content of the attribute is matched against the given value using shell style
pattern matching. If no value is specified, the existence of the sysfs
attribute is checked. This option can be specified multiple times.
--attr-nomatch=attribute=value
Do not trigger events for devices with a
matching sysfs attribute. If a value is specified along with the attribute
name, the content of the attribute is matched against the given value using
shell style pattern matching. If no value is specified, the existence of the
sysfs attribute is checked. This option can be specified multiple times.
--property-match=property=value
Trigger events for devices with a matching
property value. This option can be specified multiple times and supports shell
style pattern matching.
--tag-match=property
Trigger events for devices with a matching
tag. This option can be specified multiple times.
--sysname-match=name
Trigger events for devices with a matching sys
device name. This option can be specified multiple times and supports shell
style pattern matching.
--parent-match=syspath
Trigger events for all children of a given
device.
udevadm settle [options]¶
Watches the udev event queue, and exits if all current events are handled. --timeout=secondsMaximum number of seconds to wait for the
event queue to become empty. The default value is 120 seconds. A value of 0
will check if the queue is empty and always return immediately.
--seq-start=seqnum
Wait only for events after the given sequence
number.
--seq-end=seqnum
Wait only for events before the given sequence
number.
--exit-if-exists=file
Stop waiting if file exists.
--quiet
Do not print any output, like the remaining
queue entries when reaching the timeout.
--help
Print help text.
udevadm control command¶
Modify the internal state of the running udev daemon. --exitSignal and wait for udevd to exit.
--log-priority=value
Set the internal log level of udevd. Valid
values are the numerical syslog priorities or their textual representations:
err, info and debug.
--stop-exec-queue
Signal udevd to stop executing new events.
Incoming events will be queued.
--start-exec-queue
Signal udevd to enable the execution of
events.
--reload-rules
Signal udevd to reload the rules files. The
udev daemon detects changes automatically, this option is usually not needed.
Reloading rules does not apply any changes to already existing devices.
--property=KEY=value
Set a global property for all events.
--children-max=value
Set the maximum number of events, udevd will
handle at the same time.
--timeout=seconds
The maximum number seonds to wait for a reply
from udevd.
--help
Print help text.
udevadm monitor [options]¶
Listens to the kernel uevents and events sent out by a udev rule and prints the devpath of the event to the console. It can be used to analyze the event timing, by comparing the timestamps of the kernel uevent and the udev event. --kernelPrint the kernel uevents.
--udev
Print the udev event after the rule
processing.
--property
Also print the properties of the event.
--subsystem-match=string[/string]
Filter events by subsystem[/devtype]. Only
udev events with a matching subsystem value will pass.
--tag-match=string
Filter events by property. Only udev events
with a given tag attached will pass.
--help
Print help text.
udevadm test [options] devpath¶
Simulate a udev event run for the given device, and print debug output. --action=stringThe action string.
--subsystem=string
The subsystem string.
--help
Print help text.
udevadm test-builtin [options] command devpath¶
Run a built-in command for the given device, and print debug output. --helpPrint help text.
AUTHOR¶
Written by Kay Sievers kay.sievers@vrfy.org.SEE ALSO¶
udev(7) udevd(8)11/07/2011 | udev |