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    Command:

    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
    
    
    

    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.
    
           --attribute-walk
    
           --help
               Print help text.
    
       udevadm trigger [options]
           Request device events from the kernel. Usually 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, failed. The default value is devices.
    
           --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.
    
           --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.
    
           --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.
    
           --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.
    
           --max-childs=value
               Set the maximum number of events, udevd will handle at the same
               time.
    
           --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.
    
    
           --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 11/10/2009 UDEVADM(8)

    
    
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