The udev daemon is used by some Linux distributions to handle plug/unplug events for usb devices.

Follow these steps to allow users other than root to use the USRP:

Setup udev for the usrp

1. Define a group for the usrp sudo groupadd usrp

2. Add users to the usrp group sudo usermod -G usrp [username]

3. Add a new udev rule echo 'ACTION=="add", BUS=="usb", SYSFS{idVendor}=="fffe", SYSFS{idProduct}=="0002", GROUP:="usrp", MODE:="0660"' > tmpfile

sudo chown root.root tmpfile
sudo mv tmpfile /etc/udev/rules.d/10-usrp.rules

4. Load the new udev rule sudo udevadm control --reload-rules

Verify the setup

Power cycle the usrp device and:
lsusb | grep fffe:0002
You should see an entry with ID: fffe:0002
ls -lR /dev/bus/usb
You should see a device file with group usrp and mode crw-rw----

注:Udev Daemon Configuration (原文出处,翻译整理仅供参考!