Linux under the mobile phone USB display???

If you are a developer and have a lot of USB devices, it's convenient to use the following methods:

If there is no 51-android.rules file, create 51-android.rules under the/etc/udev/rules.d/directory;
The first step: Empty 51-android.rules, add the following line, once and for all (because I need to test several devices, adding one each time will be very troublesome).

1	SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", MODE="0666"

Step Two:

Modify/etc/udev/rules.d/51-android.rules do not need to restart the Linux machine, Plug and unplug the device is ready. Run ADB devices again to see that your device is connected
[email protected]:~$ adb devices
List of devices attached
0403502001011000 Device
and before that, what you see is
[email protected]:~$ adb devices
List of devices attached
???????????? No Permissions

Linux under the mobile phone USB display???