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The syntax for adding a rule using udev is as follows:
For dongles in the driver mode, and in cases when using USB Device File-system device files
# cp etc/grdnt.udev /etc/udev/rules.d/95-grdnt.rules
For dongles in HID mode:
# cp etc/grdnt_hid.udev /etc/udev/rules.d/95-grdnt_hid.rules
You need superuser privileges to write in the /etc/udev/rules.d folder
The mentioned rules prescribe udev to set read and write rights for a device file representing the Guardant dongle in the system. This allows assigning the dongle with the privileges of any user on the system.