The ultimate goal here is to turn on/off touchpad on mouse plug, soI'm trying to get some property of my mouse and my touchpad from udev database, using udevadm but I don't get how this working and unfortunately the manpage isn't clear enough to me$ lsb_release -ircDistributor ID: DebianRelease:    8.4Codename:   jessieHere is the kind of information I'm looking for :KERNEL==input16    SUBSYSTEM==input    DRIVER==    ATTR{name}==Bluetooth Laser Travel Mouse    ATTR{phys}==5c:e0:c5:9d:63:fd    ATTR{uniq}==00:07:61:ec:be:5c    ATTR{properties}==0From here I have tried this :$ udevadm info -a /sys/devices/pci0000\:00/0000\:00\:1c.3/0000\:03\:00.0/usb2/2-1/2-1\:1.0/0003\:1EA7\:0064.0002/input/input25/mouse1/`and i'm getting thisUnknown device, absolute path in /dev/ or /sys expected.If I monitor, I get this result:$ udevadm monitor -k -s inputmonitor will print the received events for:KERNEL - the kernel ueventKERNEL[4375.486738] remove   /devices/pci0000:00/0000:00:1c.3/0000:03:00.0/usb2/2-1/2-1:1.0/0003:1EA7:0064.0002/input/input25/mouse1 (input)KERNEL[4375.496500] remove   /devices/pci0000:00/0000:00:1c.3/0000:03:00.0/usb2/2-1/2-1:1.0/0003:1EA7:0064.0002/input/input25/event11 (input)KERNEL[4375.532441] remove   /devices/pci0000:00/0000:00:1c.3/0000:03:00.0/usb2/2-1/2-1:1.0/0003:1EA7:0064.0002/input/input25 (input)KERNEL[4377.840574] add      /devices/pci0000:00/0000:00:1c.3/0000:03:00.0/usb2/2-1/2-1:1.0/0003:1EA7:0064.0003/input/input26 (input)KERNEL[4377.840667] add      /devices/pci0000:00/0000:00:1c.3/0000:03:00.0/usb2/2-1/2-1:1.0/0003:1EA7:0064.0003/input/input26/mouse1 (input)KERNEL[4377.840759] add      /devices/pci0000:00/0000:00:1c.3/0000:03:00.0/usb2/2-1/2-1:1.0/0003:1EA7:0064.0003/input/input26/event11 (input)So I have also tried this:$ udevadm info -a -p /sys/devices/pci0000\:00/0000\:00\:1c.3/0000\:03\:00.0/usb2/2-1/2-1\:1.0/0003\:1EA7\:0064.0002/input/input25/and this $ udevadm info -a -p /devices/pci0000\:00/0000\:00\:1c.3/0000\:03\:00.0/usb2/2-1/2-1\:1.0/0003\:1EA7\:0064.0002/input/input25/and get this resultsyspath not foundThe only way I manage to get some property is using this command:$ udevadm info --query=all --name=/dev/input/mouse1And I get this but, I don't have the attribute I'm looking for(ie ATTR{name})P: /devices/pci0000:00/0000:00:1c.3/0000:03:00.0/usb2/2-1/2-1:1.0/0003:1EA7:0064.0003/input/input26/mouse1 N: input/mouse1 S: input/by-id/usb-1ea7_2.4G_Wireless_Mouse-mouse S: input/by-path/pci-0000:03:00.0-usb-0:1:1.0-mouse E: DEVLINKS=/dev/input/by-id/usb-1ea7_2.4G_Wireless_Mouse-mouse /dev/input/by-path/pci-0000:03:00.0-usb-0:1:1.0-mouse E: DEVNAME=/dev/input/mouse1 E: DEVPATH=/devices/pci0000:00/0000:00:1c.3/0000:03:00.0/usb2/2-1/2-1:1.0/0003:1EA7:0064.0003/input/input26/mouse1 E: ID_BUS=usb E: ID_INPUT=1 E: ID_INPUT_MOUSE=1 E: ID_MODEL=2.4G_Wireless_Mouse E: ID_MODEL_ENC=2.4G\x20Wireless\x20Mouse E: ID_MODEL_ID=0064 E: ID_PATH=pci-0000:03:00.0-usb-0:1:1.0 E: ID_PATH_TAG=pci-0000_03_00_0-usb-0_1_1_0 E: ID_REVISION=0200 E: ID_SERIAL=1ea7_2.4G_Wireless_Mouse E: ID_TYPE=hid E: ID_USB_DRIVER=usbhid E: ID_USB_INTERFACES=:030102: E: ID_USB_INTERFACE_NUM=00 E: ID_VENDOR=1ea7 E: ID_VENDOR_ENC=1ea7 E: ID_VENDOR_ID=1ea7 E: MAJOR=13 E: MINOR=33 E: SUBSYSTEM=input E: USEC_INITIALIZED=77840674So clearly I've a misunderstanding on how to query udev to get the attribute of a device.Hope I'm clear enough if anyone has an idea where I'm mistaking any input is welcome !Thanks !Matth.
confused about udevadm usage
linux;debian;command line;udev
Note that the input number changed (from 25, what you tried, to 26, what ), because those are not guaranteed to be constant across boots. Try udevadm info -q path -n /dev/input/by-id/usb-1ea7_2.4G_Wireless_Mouse-mousewith the constant by-id symlinkg to get the path in the format udev expects, then something like udevadm info -a -p /path/you/just/gotto walk the path and output all attributes along the way (you may need to use parent attributes to identify it).You can also combine that:udevadm info -a -p $(udevadm info -q path -n /dev/whatever)