OPTIONS¶
--debug
Print 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=type
Query 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.
--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.
--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.
--version
Print version.
--help
Print help text.
udevadm trigger [options]¶
Request device events from the kernel. Usually used to replay
events at system coldplug time.
--verbose
Print 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, failed. The default value is
devices.
--action=action
Type of event to be triggered. The default value is
add.
--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.
--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.
udevadm settle [options]¶
Watches the udev event queue, and exits if all current events are
handled.
--timeout=seconds
Maximum number of seconds to wait for the event queue to
become empty. The default value is 180 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.
--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.
--max-childs=value
Set the maximum number of events, udevd will handle at
the same time.
--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.
--kernel
Print the kernel uevents.
--udev
Print the udev event after the rule processing.
--property
Also print the properties of the event.
--help
Print help text.
udevadm test [options] devpath¶
Simulate a udev event run for the given device, and print debug
output.
--action=string
The action string.
--subsystem=string
The subsystem string.
--help
Print help text.