udevadm


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

       udevadm info options

       udevadm trigger [options]

       udevadm settle [options]

       udevadm control command

       udevadm monitor [options]

       udevadm test [options] devpath

       udevadm test-builtin [options] command 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.


       --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.
           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.

           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.

   udevadm test-builtin [options] command devpath
       Run a built-in command for the given device, and print debug output.

       --help
           Print help text.

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