I am sorry to necrobump, but I don't get it.

$ sudo echo -n '2-3' | tee -a /sys/bus/usb/drivers/usb/unbind

Produces, on my system, this: 'tee: unbind: Permission denied'.
Similarly if I have used 'su' to obtain root:

# echo -n '2-3' | tee -a /sys/bus/usb/drivers/usb/unbind
2-3tee: /sys/bus/usb/drivers/usb/unbind: No such device
# ls /sys/bus/usb/drivers/usb
1-1  1-1.2  1-1.6  2-1  bind  uevent  unbind  usb1  usb2  usb3  usb4

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https://bugs.launchpad.net/bugs/288964

Title:
  sudo does not work with unbinding usb interface from usbhid driver

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