November 2007 udev udevadm 8 udevadmudev management tool udevadm info options udevadm trigger options udevadm settle options udevadm control command udevadm monitor options udevadm test options devpath udevadm version udevadm help 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. 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, env, 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. Request device uevents, usually used to replay events at system coldplug. --verbose Print the list of devices which will be triggered. --dry-run Do not actually trigger the event. --retry-failed Trigger only the events which are failed during a previous run. --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. --socket=path Pass the synthesized events to the specified socket, instead of triggering a global kernel event. All available event values will be send in the same format the kernel sends an uevent, or RUN+="socket:path" sends a message. If the first character of the specified path is an @ character, an abstract namespace socket is used, instead of an existing socket file. --env=KEY=value Pass an additional environemt key to the event. This works only with the --socket option. 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. --help Print help text. 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 from the config. --env=KEY=value Set global variable. --max-childs=value Set the maximum number of events, udevd will handle at the same time. --max-childs-running=value Set the maximum number of events, which are allowed to run at the same time. --help Print help text. 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. --environment Print the complete environment for all events. Can be used to compare the kernel supplied and the udev added environment values. --kernel Print the kernel uevents. --udev Print the udev event after the rule processing. --help Print help text. Simulate a udev event run for the given device, and print out debug output. Unless forced to, no device node or symlink will be created. --action=string The action string. --subsystem=string The subsystem string. --force Force the creation of a device node or symlink. Usually the test run prints only debug output. --help Print help text. Print version number. Print help text. Written by Kay Sievers kay.sievers@vrfy.org. udev7 udevd8