-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.
Query the udev database for device information.
Positional arguments should be used to specify one or more
devices. Each one may be a device name (in which case it must start with
/dev/), a sys path (in which case it must start with /sys/), or a systemd
device unit name (in which case it must end with ".device", see
systemd.device(5)).
-q, --query=TYPE
Query the database for the specified type of device data.
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. This option is an alternative to the positional
argument with a /sys/ prefix. 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. This option is an alternative to the positional argument with a
/dev/ prefix. 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. This takes effects only when --query=property or
--device-id-of-file=FILE is specified.
-P, --export-prefix=NAME
Add a prefix to the key name of exported values. This
implies --export.
-d, --device-id-of-file=FILE
Print major/minor numbers of the underlying device, where
the file lives on. If this is specified, all positional arguments are
ignored.
-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.
Request device events from the kernel. Primarily used to replay
events at system coldplug time.
Takes a device specification as a positional argument. See the
description of info above.
-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 supports shell style pattern matching. When this option
is specified more than once, then each matching result is ORed, that is, all
the devices in each subsystem are triggered.
-S, --subsystem-nomatch=SUBSYSTEM
Do not trigger events for devices which belong to a
matching subsystem. This option supports shell style pattern matching. When
this option is specified more than once, then each matching result is ANDed,
that is, devices which do not match all specified subsystems are
triggered.
-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. When this option is specified multiple times, then each matching
result is ANDed, that is, only devices which have all specified attributes are
triggered.
-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. When this option is specified multiple times, then each matching
result is ANDed, that is, only devices which have none of the specified
attributes are triggered.
-p,
--property-match=PROPERTY=VALUE
Trigger events for devices with a matching property
value. This option supports shell style pattern matching. When this option is
specified more than once, then each matching result is ORed, that is, devices
which have one of the specified properties are triggered.
-g, --tag-match=PROPERTY
Trigger events for devices with a matching tag. When this
option is specified multiple times, then each matching result is ANDed, that
is, devices which have all specified tags are triggered.
-y, --sysname-match=NAME
Trigger events for devices for which the last component
(i.e. the filename) of the /sys path matches the specified PATH. This
option supports shell style pattern matching. When this option is specified
more than once, then each matching result is ORed, that is, all devices which
have any of the specified NAME are triggered.
--name-match=NAME
Trigger events for devices with a matching device path.
When this option is specified more than once, the last NAME is
used.
-b, --parent-match=SYSPATH
Trigger events for all children of a given device. When
this option is specified more than once, the last NAME is used.
-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.
--wait-daemon[=SECONDS]
Before triggering uevents, wait for systemd-udevd daemon
to be initialized. Optionally takes timeout value. Default timeout is 5
seconds. This is equivalent to invoke invoking udevadm control --ping
before udevadm trigger.
-h, --help
Print a short help text and exit.
In addition, an optional positional argument can be used to
specify device name or sys path. It must start with /dev or /sys
respectively.
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.
Modify the internal state of the running udev daemon.
-e, --exit
Signal and wait for systemd-udevd to exit. Note that
systemd-udevd.service contains
Restart=always and so as a result, this
option restarts systemd-udevd. If you want to stop systemd-udevd.service,
please use the following:
systemctl stop systemd-udevd-control.socket systemd-udevd-kernel.socket systemd-udevd.service
-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.
--ping
Send a ping message to systemd-udevd and wait for the
reply. This may be useful to check that systemd-udevd daemon is running.
-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.
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.
When this option is specified more than once, then each matching result is
ORed, that is, all devices in the specified subsystems are monitored.
-t, --tag-match=string
Filter udev events by tag. Only udev events with a given
tag attached will pass. When this option is specified more than once, then
each matching result is ORed, that is, devices which have one of the specified
tags are monitored.
-h, --help
Print a short help text and exit.
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.
Run a built-in command COMMAND for device DEVPATH,
and print debug output.
-h, --help
Print a short help text and exit.