OPTIONS¶
-d, --debug
Print debug messages to standard error. This option is
implied in udevadm test and udevadm test-builtin commands.
-h, --help
Print a short help text and exit.
udevadm info [options] [devpath|file]¶
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.
-q, --query=TYPE
Query the database for the specified type of device data.
It needs the --path or --name to identify the specified device.
Valid TYPEs are: name, symlink, path,
property, all.
-p, --path=DEVPATH
The /sys path of the device to query, e.g.
[/sys]/class/block/sda. Note that this option usually is not very useful,
since udev can guess the type of the argument, so udevadm info
--path=/class/block/sda is equivalent to udevadm info
/sys/class/block/sda.
-n, --name=FILE
The name of the device node or a symlink to query, e.g.
[/dev]/sda. Note that this option usually is not very useful, since
udev can guess the type of the argument, so udevadm info
--name=sda is equivalent to udevadm info /dev/sda.
-r, --root
Print absolute paths in name or symlink
query.
-a, --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.
-x, --export
Print output as key/value pairs. Values are enclosed in
single quotes.
-P, --export-prefix=NAME
Add a prefix to the key name of exported values.
-d, --device-id-of-file=FILE
Print major/minor numbers of the underlying device, where
the file lives on.
-e, --export-db
Export the content of the udev database.
-c, --cleanup-db
Cleanup the udev database.
-h, --help
Print a short help text and exit.
In addition, an optional positional argument can be used to
specify a device name or a sys path. It must start with /dev or /sys
respectively.
udevadm trigger [options] [devpath|file...]¶
Request device events from the kernel. Primarily used to replay
events at system coldplug time.
-v, --verbose
Print the list of devices which will be triggered.
-n, --dry-run
Do not actually trigger the event.
-t, --type=TYPE
Trigger a specific type of devices. Valid types are:
devices, subsystems. The default value is devices.
-c, --action=ACTION
Type of event to be triggered. The default value is
change.
-s, --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.
-S, --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.
-a,
--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.
-A,
--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.
-p,
--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.
-g, --tag-match=PROPERTY
Trigger events for devices with a matching tag. This
option can be specified multiple times.
-y, --sysname-match=PATH
Trigger events for devices for which the last component
(i.e. the filename) of the /sys path matches the specified PATH. This
option can be specified multiple times and also supports shell style pattern
matching.
--name-match=NAME
Trigger events for devices with a matching device path.
This option can be specified multiple times.
-b, --parent-match=SYSPATH
Trigger events for all children of a given device.
-w, --settle
Apart from triggering events, also waits for those events
to finish. Note that this is different from calling udevadm settle.
udevadm settle waits for all events to finish. This option only waits
for events triggered by the same command to finish.
-h, --help
Print a short help text and exit.
In addition, optional positional arguments can be used to specify
device names or sys paths. They must start with /dev or /sys
respectively.
udevadm settle [options]¶
Watches the udev event queue, and exits if all current events are
handled.
-t, --timeout=SECONDS
Maximum 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.
-E, --exit-if-exists=FILE
Stop waiting if file exists.
-h, --help
Print a short help text and exit.
udevadm control option¶
Modify the internal state of the running udev daemon.
-e, --exit
Signal and wait for systemd-udevd to exit.
-l, --log-priority=value
Set the internal log level of systemd-udevd. Valid values
are the numerical syslog priorities or their textual representations:
emerg, alert, crit, err, warning,
notice, info, and debug.
-s, --stop-exec-queue
Signal systemd-udevd to stop executing new events.
Incoming events will be queued.
-S, --start-exec-queue
Signal systemd-udevd to enable the execution of
events.
-R, --reload
Signal systemd-udevd to reload the rules files and other
databases like the kernel module index. Reloading rules and databases does not
apply any changes to already existing devices; the new configuration will only
be applied to new events.
-p,
--property=KEY=value
Set a global property for all events.
-m, --children-max=value
Set the maximum number of events, systemd-udevd will
handle at the same time.
-t, --timeout=seconds
The maximum number of seconds to wait for a reply from
systemd-udevd.
-h, --help
Print a short help text and exit.
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.
-k, --kernel
Print the kernel uevents.
-u, --udev
Print the udev event after the rule processing.
-p, --property
Also print the properties of the event.
-s,
--subsystem-match=string[/string]
Filter kernel uevents and udev events by
subsystem[/devtype]. Only events with a matching subsystem value will
pass.
-t, --tag-match=string
Filter udev events by tag. Only udev events with a given
tag attached will pass.
-h, --help
Print a short help text and exit.
udevadm test [options] [devpath]¶
Simulate a udev event run for the given device, and print debug
output.
-a, --action=string
The action string.
-N,
--resolve-names=early|late|never
Specify when udevadm should resolve names of users and
groups. When set to early (the default), names will be resolved when
the rules are parsed. When set to late, names will be resolved for
every event. When set to never, names will never be resolved and all
devices will be owned by root.
-h, --help
Print a short help text and exit.
udevadm test-builtin [options] [command] [devpath]¶
Run a built-in command COMMAND for device DEVPATH,
and print debug output.
-h, --help
Print a short help text and exit.