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UDEVADM(8)				     udevadm				       UDEVADM(8)

NAME
       udevadm - udev management tool

SYNOPSIS
       udevadm [--debug] [--version] [--help]

       udevadm info options

       udevadm trigger [options]

       udevadm settle [options]

       udevadm control command

       udevadm monitor [options]

       udevadm test [options] 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
       --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.

       --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.

       --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. 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=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.

       --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.

       --exit
	   Signal 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.

       --kernel
	   Print 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=string
	   The action string.

       --subsystem=string
	   The subsystem string.

       --help
	   Print help text.

AUTHOR
       Written by Kay Sievers kay.sievers@vrfy.org.

SEE ALSO
       udev(7) udevd(8)

udev					    07/30/2011				       UDEVADM(8)
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