Udevadm info starts with the device specified by the devpath and then walks up the chain of parent devices. It prints for every device found, all possible attributes in the udev rules key format. A rule to match, can be composed by the attributes of the device and the attributes from one single parent device. looking at device '/devices/pci0000:00/0000:00:02.1/0000:03:00.0/0000:04:0c.0/0000:69:00.0/usb5/5-8/5-8:1.1/0003:0C70:F011.000B/hwmon/hwmon6': KERNEL=="hwmon6" SUBSYSTEM=="hwmon" DRIVER=="" ATTR{curr1_input}=="0" ATTR{curr1_label}=="Fan 1 current" ATTR{curr2_input}=="0" ATTR{curr2_label}=="Fan 2 current" ATTR{curr3_input}=="0" ATTR{curr3_label}=="Fan 3 current" ATTR{curr4_input}=="0" ATTR{curr4_label}=="Fan 4 current" ATTR{curr5_input}=="0" ATTR{curr5_label}=="Fan 5 current" ATTR{curr6_input}=="0" ATTR{curr6_label}=="Fan 6 current" ATTR{curr7_input}=="2" ATTR{curr7_label}=="Fan 7 current" ATTR{curr8_input}=="0" ATTR{curr8_label}=="Fan 8 current" ATTR{fan1_input}=="0" ATTR{fan1_label}=="Fan 1 speed" ATTR{fan2_input}=="0" ATTR{fan2_label}=="Fan 2 speed" ATTR{fan3_input}=="0" ATTR{fan3_label}=="Fan 3 speed" ATTR{fan4_input}=="0" ATTR{fan4_label}=="Fan 4 speed" ATTR{fan5_input}=="0" ATTR{fan5_label}=="Fan 5 speed" ATTR{fan6_input}=="0" ATTR{fan6_label}=="Fan 6 speed" ATTR{fan7_input}=="3523" ATTR{fan7_label}=="Fan 7 speed" ATTR{fan8_input}=="3565" ATTR{fan8_label}=="Fan 8 speed" ATTR{fan9_input}=="483" ATTR{fan9_label}=="Flow speed [dL/h]" ATTR{fan9_pulses}=="167" ATTR{in0_input}=="12170" ATTR{in0_label}=="Fan 1 voltage" ATTR{in1_input}=="12180" ATTR{in1_label}=="Fan 2 voltage" ATTR{in2_input}=="0" ATTR{in2_label}=="Fan 3 voltage" ATTR{in3_input}=="0" ATTR{in3_label}=="Fan 4 voltage" ATTR{in4_input}=="0" ATTR{in4_label}=="Fan 5 voltage" ATTR{in5_input}=="12170" ATTR{in5_label}=="Fan 6 voltage" ATTR{in6_input}=="12180" ATTR{in6_label}=="Fan 7 voltage" ATTR{in7_input}=="12180" ATTR{in7_label}=="Fan 8 voltage" ATTR{name}=="octo" ATTR{power/control}=="auto" ATTR{power/runtime_active_time}=="0" ATTR{power/runtime_status}=="unsupported" ATTR{power/runtime_suspended_time}=="0" ATTR{power1_input}=="0" ATTR{power1_label}=="Fan 1 power" ATTR{power2_input}=="0" ATTR{power2_label}=="Fan 2 power" ATTR{power3_input}=="0" ATTR{power3_label}=="Fan 3 power" ATTR{power4_input}=="0" ATTR{power4_label}=="Fan 4 power" ATTR{power5_input}=="0" ATTR{power5_label}=="Fan 5 power" ATTR{power6_input}=="0" ATTR{power6_label}=="Fan 6 power" ATTR{power7_input}=="20000" ATTR{power7_label}=="Fan 7 power" ATTR{power8_input}=="0" ATTR{power8_label}=="Fan 8 power" ATTR{pwm1}=="141" ATTR{pwm2}=="128" ATTR{pwm3}=="128" ATTR{pwm4}=="127" ATTR{pwm5}=="255" ATTR{pwm6}=="204" ATTR{pwm7}=="203" ATTR{pwm8}=="204" ATTR{temp10_label}=="Virtual sensor 6" ATTR{temp11_label}=="Virtual sensor 7" ATTR{temp12_label}=="Virtual sensor 8" ATTR{temp13_label}=="Virtual sensor 9" ATTR{temp14_label}=="Virtual sensor 10" ATTR{temp15_label}=="Virtual sensor 11" ATTR{temp16_label}=="Virtual sensor 12" ATTR{temp17_label}=="Virtual sensor 13" ATTR{temp18_label}=="Virtual sensor 14" ATTR{temp19_label}=="Virtual sensor 15" ATTR{temp1_input}=="35060" ATTR{temp1_label}=="Sensor 1" ATTR{temp1_offset}=="0" ATTR{temp20_label}=="Virtual sensor 16" ATTR{temp2_input}=="37760" ATTR{temp2_label}=="Sensor 2" ATTR{temp2_offset}=="0" ATTR{temp3_label}=="Sensor 3" ATTR{temp3_offset}=="0" ATTR{temp4_label}=="Sensor 4" ATTR{temp4_offset}=="0" ATTR{temp5_label}=="Virtual sensor 1" ATTR{temp6_label}=="Virtual sensor 2" ATTR{temp7_label}=="Virtual sensor 3" ATTR{temp8_label}=="Virtual sensor 4" ATTR{temp9_label}=="Virtual sensor 5" looking at parent device '/devices/pci0000:00/0000:00:02.1/0000:03:00.0/0000:04:0c.0/0000:69:00.0/usb5/5-8/5-8:1.1/0003:0C70:F011.000B': KERNELS=="0003:0C70:F011.000B" SUBSYSTEMS=="hid" DRIVERS=="aquacomputer_d5next" ATTRS{country}=="00" ATTRS{power/control}=="auto" ATTRS{power/runtime_active_time}=="0" ATTRS{power/runtime_status}=="unsupported" ATTRS{power/runtime_suspended_time}=="0" looking at parent device '/devices/pci0000:00/0000:00:02.1/0000:03:00.0/0000:04:0c.0/0000:69:00.0/usb5/5-8/5-8:1.1': KERNELS=="5-8:1.1" SUBSYSTEMS=="usb" DRIVERS=="usbhid" ATTRS{authorized}=="1" ATTRS{bAlternateSetting}==" 0" ATTRS{bInterfaceClass}=="03" ATTRS{bInterfaceNumber}=="01" ATTRS{bInterfaceProtocol}=="00" ATTRS{bInterfaceSubClass}=="00" ATTRS{bNumEndpoints}=="01" ATTRS{interface}=="Device" ATTRS{physical_location/dock}=="no" ATTRS{physical_location/horizontal_position}=="left" ATTRS{physical_location/lid}=="no" ATTRS{physical_location/panel}=="top" ATTRS{physical_location/vertical_position}=="upper" ATTRS{supports_autosuspend}=="1" looking at parent device '/devices/pci0000:00/0000:00:02.1/0000:03:00.0/0000:04:0c.0/0000:69:00.0/usb5/5-8': KERNELS=="5-8" SUBSYSTEMS=="usb" DRIVERS=="usb" ATTRS{authorized}=="1" ATTRS{avoid_reset_quirk}=="0" ATTRS{bConfigurationValue}=="1" ATTRS{bDeviceClass}=="ef" ATTRS{bDeviceProtocol}=="01" ATTRS{bDeviceSubClass}=="02" ATTRS{bMaxPacketSize0}=="64" ATTRS{bMaxPower}=="2mA" ATTRS{bNumConfigurations}=="1" ATTRS{bNumInterfaces}==" 2" ATTRS{bcdDevice}=="0100" ATTRS{bmAttributes}==" 1" ATTRS{busnum}=="5" ATTRS{configuration}=="Default" ATTRS{devnum}=="5" ATTRS{devpath}=="8" ATTRS{idProduct}=="f011" ATTRS{idVendor}=="0c70" ATTRS{ltm_capable}=="no" ATTRS{manufacturer}=="Aqua Computer GmbH & Co. KG" ATTRS{maxchild}=="0" ATTRS{physical_location/dock}=="no" ATTRS{physical_location/horizontal_position}=="left" ATTRS{physical_location/lid}=="no" ATTRS{physical_location/panel}=="top" ATTRS{physical_location/vertical_position}=="upper" ATTRS{power/active_duration}=="6362284" ATTRS{power/autosuspend}=="2" ATTRS{power/autosuspend_delay_ms}=="2000" ATTRS{power/connected_duration}=="6362284" ATTRS{power/control}=="on" ATTRS{power/level}=="on" ATTRS{power/persist}=="1" ATTRS{power/runtime_active_time}=="6361742" ATTRS{power/runtime_status}=="active" ATTRS{power/runtime_suspended_time}=="0" ATTRS{product}=="OCTO" ATTRS{quirks}=="0x0" ATTRS{removable}=="removable" ATTRS{remove}=="(not readable)" ATTRS{rx_lanes}=="1" ATTRS{serial}=="09418-05435" ATTRS{speed}=="12" ATTRS{tx_lanes}=="1" ATTRS{urbnum}=="33562" ATTRS{version}==" 2.10" looking at parent device '/devices/pci0000:00/0000:00:02.1/0000:03:00.0/0000:04:0c.0/0000:69:00.0/usb5': KERNELS=="usb5" SUBSYSTEMS=="usb" DRIVERS=="usb" ATTRS{authorized}=="1" ATTRS{authorized_default}=="1" ATTRS{avoid_reset_quirk}=="0" ATTRS{bConfigurationValue}=="1" ATTRS{bDeviceClass}=="09" ATTRS{bDeviceProtocol}=="01" ATTRS{bDeviceSubClass}=="00" ATTRS{bMaxPacketSize0}=="64" ATTRS{bMaxPower}=="0mA" ATTRS{bNumConfigurations}=="1" ATTRS{bNumInterfaces}==" 1" ATTRS{bcdDevice}=="0610" ATTRS{bmAttributes}=="e0" ATTRS{busnum}=="5" ATTRS{configuration}=="" ATTRS{devnum}=="1" ATTRS{devpath}=="0" ATTRS{idProduct}=="0002" ATTRS{idVendor}=="1d6b" ATTRS{interface_authorized_default}=="1" ATTRS{ltm_capable}=="no" ATTRS{manufacturer}=="Linux 6.10.6-arch1-1 xhci-hcd" ATTRS{maxchild}=="12" ATTRS{power/active_duration}=="6363840" ATTRS{power/autosuspend}=="0" ATTRS{power/autosuspend_delay_ms}=="0" ATTRS{power/connected_duration}=="6363840" ATTRS{power/control}=="auto" ATTRS{power/level}=="auto" ATTRS{power/runtime_active_time}=="6363782" ATTRS{power/runtime_status}=="active" ATTRS{power/runtime_suspended_time}=="0" ATTRS{power/wakeup}=="disabled" ATTRS{power/wakeup_abort_count}=="" ATTRS{power/wakeup_active}=="" ATTRS{power/wakeup_active_count}=="" ATTRS{power/wakeup_count}=="" ATTRS{power/wakeup_expire_count}=="" ATTRS{power/wakeup_last_time_ms}=="" ATTRS{power/wakeup_max_time_ms}=="" ATTRS{power/wakeup_total_time_ms}=="" ATTRS{product}=="xHCI Host Controller" ATTRS{quirks}=="0x0" ATTRS{removable}=="unknown" ATTRS{remove}=="(not readable)" ATTRS{rx_lanes}=="1" ATTRS{serial}=="0000:69:00.0" ATTRS{speed}=="480" ATTRS{tx_lanes}=="1" ATTRS{urbnum}=="70" ATTRS{version}==" 2.00" looking at parent device '/devices/pci0000:00/0000:00:02.1/0000:03:00.0/0000:04:0c.0/0000:69:00.0': KERNELS=="0000:69:00.0" SUBSYSTEMS=="pci" DRIVERS=="xhci_hcd" ATTRS{ari_enabled}=="0" ATTRS{broken_parity_status}=="0" ATTRS{class}=="0x0c0330" ATTRS{consistent_dma_mask_bits}=="64" ATTRS{current_link_speed}=="2.5 GT/s PCIe" ATTRS{current_link_width}=="1" ATTRS{d3cold_allowed}=="1" ATTRS{dbc}=="disabled" ATTRS{dbc_bInterfaceProtocol}=="01" ATTRS{dbc_bcdDevice}=="0010" ATTRS{dbc_idProduct}=="0010" ATTRS{dbc_idVendor}=="1d6b" ATTRS{device}=="0x43f7" ATTRS{dma_mask_bits}=="64" ATTRS{driver_override}=="(null)" ATTRS{enable}=="1" ATTRS{irq}=="24" ATTRS{link/l0s_aspm}=="0" ATTRS{local_cpulist}=="0-31" ATTRS{local_cpus}=="ffffffff" ATTRS{max_link_speed}=="2.5 GT/s PCIe" ATTRS{max_link_width}=="1" ATTRS{msi_bus}=="1" ATTRS{msi_irqs/170}=="msix" ATTRS{msi_irqs/171}=="msix" ATTRS{msi_irqs/172}=="msix" ATTRS{msi_irqs/173}=="msix" ATTRS{msi_irqs/174}=="msix" ATTRS{msi_irqs/175}=="msix" ATTRS{msi_irqs/176}=="msix" ATTRS{msi_irqs/177}=="msix" ATTRS{numa_node}=="-1" ATTRS{power/control}=="auto" ATTRS{power/runtime_active_time}=="6367217" ATTRS{power/runtime_status}=="active" ATTRS{power/runtime_suspended_time}=="0" ATTRS{power/wakeup}=="enabled" ATTRS{power/wakeup_abort_count}=="0" ATTRS{power/wakeup_active}=="0" ATTRS{power/wakeup_active_count}=="0" ATTRS{power/wakeup_count}=="0" ATTRS{power/wakeup_expire_count}=="0" ATTRS{power/wakeup_last_time_ms}=="0" ATTRS{power/wakeup_max_time_ms}=="0" ATTRS{power/wakeup_total_time_ms}=="0" ATTRS{power_state}=="D0" ATTRS{remove}=="(not readable)" ATTRS{rescan}=="(not readable)" ATTRS{reset}=="(not readable)" ATTRS{reset_method}=="bus" ATTRS{resource0}=="(not readable)" ATTRS{revision}=="0x01" ATTRS{subsystem_device}=="0x1142" ATTRS{subsystem_vendor}=="0x1b21" ATTRS{vendor}=="0x1022" looking at parent device '/devices/pci0000:00/0000:00:02.1/0000:03:00.0/0000:04:0c.0': KERNELS=="0000:04:0c.0" SUBSYSTEMS=="pci" DRIVERS=="pcieport" ATTRS{ari_enabled}=="0" ATTRS{broken_parity_status}=="0" ATTRS{class}=="0x060400" ATTRS{consistent_dma_mask_bits}=="32" ATTRS{current_link_speed}=="2.5 GT/s PCIe" ATTRS{current_link_width}=="1" ATTRS{d3cold_allowed}=="1" ATTRS{device}=="0x43f5" ATTRS{dma_mask_bits}=="32" ATTRS{driver_override}=="(null)" ATTRS{enable}=="2" ATTRS{irq}=="24" ATTRS{local_cpulist}=="0-31" ATTRS{local_cpus}=="ffffffff" ATTRS{max_link_speed}=="2.5 GT/s PCIe" ATTRS{max_link_width}=="1" ATTRS{msi_bus}=="1" ATTRS{numa_node}=="-1" ATTRS{power/autosuspend_delay_ms}=="100" ATTRS{power/control}=="auto" ATTRS{power/runtime_active_time}=="6367228" ATTRS{power/runtime_status}=="active" ATTRS{power/runtime_suspended_time}=="0" ATTRS{power/wakeup}=="enabled" ATTRS{power/wakeup_abort_count}=="0" ATTRS{power/wakeup_active}=="0" ATTRS{power/wakeup_active_count}=="0" ATTRS{power/wakeup_count}=="0" ATTRS{power/wakeup_expire_count}=="0" ATTRS{power/wakeup_last_time_ms}=="0" ATTRS{power/wakeup_max_time_ms}=="0" ATTRS{power/wakeup_total_time_ms}=="0" ATTRS{power_state}=="D0" ATTRS{remove}=="(not readable)" ATTRS{rescan}=="(not readable)" ATTRS{revision}=="0x01" ATTRS{secondary_bus_number}=="105" ATTRS{subordinate_bus_number}=="105" ATTRS{subsystem_device}=="0x3328" ATTRS{subsystem_vendor}=="0x1b21" ATTRS{vendor}=="0x1022" looking at parent device '/devices/pci0000:00/0000:00:02.1/0000:03:00.0': KERNELS=="0000:03:00.0" SUBSYSTEMS=="pci" DRIVERS=="pcieport" ATTRS{ari_enabled}=="0" ATTRS{broken_parity_status}=="0" ATTRS{class}=="0x060400" ATTRS{consistent_dma_mask_bits}=="32" ATTRS{current_link_speed}=="16.0 GT/s PCIe" ATTRS{current_link_width}=="4" ATTRS{d3cold_allowed}=="1" ATTRS{device}=="0x43f4" ATTRS{dma_mask_bits}=="32" ATTRS{driver_override}=="(null)" ATTRS{enable}=="2" ATTRS{irq}=="24" ATTRS{local_cpulist}=="0-31" ATTRS{local_cpus}=="ffffffff" ATTRS{max_link_speed}=="16.0 GT/s PCIe" ATTRS{max_link_width}=="4" ATTRS{msi_bus}=="1" ATTRS{numa_node}=="-1" ATTRS{power/autosuspend_delay_ms}=="100" ATTRS{power/control}=="auto" ATTRS{power/runtime_active_time}=="6367228" ATTRS{power/runtime_status}=="active" ATTRS{power/runtime_suspended_time}=="0" ATTRS{power/wakeup}=="enabled" ATTRS{power/wakeup_abort_count}=="0" ATTRS{power/wakeup_active}=="0" ATTRS{power/wakeup_active_count}=="0" ATTRS{power/wakeup_count}=="0" ATTRS{power/wakeup_expire_count}=="0" ATTRS{power/wakeup_last_time_ms}=="0" ATTRS{power/wakeup_max_time_ms}=="0" ATTRS{power/wakeup_total_time_ms}=="0" ATTRS{power_state}=="D0" ATTRS{remove}=="(not readable)" ATTRS{rescan}=="(not readable)" ATTRS{reset}=="(not readable)" ATTRS{reset_method}=="pm bus" ATTRS{revision}=="0x01" ATTRS{secondary_bus_number}=="4" ATTRS{subordinate_bus_number}=="106" ATTRS{subsystem_device}=="0x3328" ATTRS{subsystem_vendor}=="0x1b21" ATTRS{vendor}=="0x1022" looking at parent device '/devices/pci0000:00/0000:00:02.1': KERNELS=="0000:00:02.1" SUBSYSTEMS=="pci" DRIVERS=="pcieport" ATTRS{ari_enabled}=="0" ATTRS{broken_parity_status}=="0" ATTRS{class}=="0x060400" ATTRS{consistent_dma_mask_bits}=="32" ATTRS{current_link_speed}=="16.0 GT/s PCIe" ATTRS{current_link_width}=="4" ATTRS{d3cold_allowed}=="1" ATTRS{device}=="0x14db" ATTRS{dma_mask_bits}=="32" ATTRS{driver_override}=="(null)" ATTRS{enable}=="2" ATTRS{irq}=="30" ATTRS{local_cpulist}=="0-31" ATTRS{local_cpus}=="ffffffff" ATTRS{max_link_speed}=="32.0 GT/s PCIe" ATTRS{max_link_width}=="4" ATTRS{msi_bus}=="1" ATTRS{msi_irqs/30}=="msi" ATTRS{numa_node}=="-1" ATTRS{power/control}=="on" ATTRS{power/runtime_active_time}=="6367232" ATTRS{power/runtime_status}=="active" ATTRS{power/runtime_suspended_time}=="0" ATTRS{power/wakeup}=="disabled" ATTRS{power/wakeup_abort_count}=="" ATTRS{power/wakeup_active}=="" ATTRS{power/wakeup_active_count}=="" ATTRS{power/wakeup_count}=="" ATTRS{power/wakeup_expire_count}=="" ATTRS{power/wakeup_last_time_ms}=="" ATTRS{power/wakeup_max_time_ms}=="" ATTRS{power/wakeup_total_time_ms}=="" ATTRS{power_state}=="D0" ATTRS{remove}=="(not readable)" ATTRS{rescan}=="(not readable)" ATTRS{reset}=="(not readable)" ATTRS{reset_method}=="pm" ATTRS{revision}=="0x00" ATTRS{secondary_bus_number}=="3" ATTRS{subordinate_bus_number}=="106" ATTRS{subsystem_device}=="0x8877" ATTRS{subsystem_vendor}=="0x1043" ATTRS{vendor}=="0x1022" looking at parent device '/devices/pci0000:00': KERNELS=="pci0000:00" SUBSYSTEMS=="" DRIVERS=="" ATTRS{power/control}=="auto" ATTRS{power/runtime_active_time}=="0" ATTRS{power/runtime_status}=="unsupported" ATTRS{power/runtime_suspended_time}=="0" ATTRS{waiting_for_supplier}=="0"