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sources/tech/20151012 Linux FAQs with Answers--How to change USB device permission permanently on Linux.md
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Linux FAQs with Answers--How to change USB device permission permanently on Linux
================================================================================
> **Question**: I am trying to run gpsd on my Linux with a USB GPS receiver. However, I am getting the following errors from gpsd.
>
> gpsd[377]: gpsd:ERROR: read-only device open failed: Permission denied
> gpsd[377]: gpsd:ERROR: /dev/ttyUSB0: device activation failed.
> gpsd[377]: gpsd:ERROR: device open failed: Permission denied - retrying read-only
>
> Looks like gpsd does not have permission to access the USB device (/dev/ttyUSB0). How can I change its default permission mode permanently on Linux?
When you run a process that wants to read or write to a USB device, the user/group of the process must have appropriate permission to do so. Of course you can change the permission of your USB device manually with chmod command, but such manual permission change will be temporary. The USB device will revert to its default permission mode when you reboot your Linux machine.
![](https://farm6.staticflickr.com/5741/20848677843_202ff53303_c.jpg)
As a permanent solution, you can create a udev-based USB permission rule which assigns any custom permission mode of your choice. Here is how to do it.
First, you need to identify the vendorID and productID of your USB device. For that, use lsusb command.
$ lsusb -vvv
![](https://farm1.staticflickr.com/731/20848677743_39f76eb403_c.jpg)
From the lsusb output, find your USB device's entry, and look for "idVendor" and "idProduct" fields. In this example, we have idVendor (0x067b) and idProduct (0x2303).
Next, create a new udev rule as follows.
$ sudo vi /etc/udev/rules.d/50-myusb.rules
----------
SUBSYSTEMS=="usb", ATTRS{idVendor}=="067b", ATTRS{idProduct}=="2303", GROUP="users", MODE="0666"
Replace "idVendor" and "idProduct" values with your own. **MODE="0666"** indicates the preferred permission of the USB device.
Now reboot your machine or reload udev rules:
$ sudo udevadm control --reload
Then verify the permission of the USB device.
![](https://farm1.staticflickr.com/744/21282872179_9a4a05d768_b.jpg)
--------------------------------------------------------------------------------
via: http://ask.xmodulo.com/change-usb-device-permission-linux.html
作者：[Dan Nanni][a]
译者：[译者ID](https://github.com/译者ID)
校对：[校对者ID](https://github.com/校对者ID)
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
[a]:http://ask.xmodulo.com/author/nanni

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Linux有问必答 -- 如何在LInux中永久修改USB设备权限
================================================================================
> **提问**：当我尝试在Linux中运行USB GPS接收器时我遇到了下面来自gpsd的错误。
>
> gpsd[377]: gpsd:ERROR: read-only device open failed: Permission denied
> gpsd[377]: gpsd:ERROR: /dev/ttyUSB0: device activation failed.
> gpsd[377]: gpsd:ERROR: device open failed: Permission denied - retrying read-only
>
> 看上去gpsd没有权限访问USB设备（/dev/ttyUSB0）。我该如何永久修改它在Linux上的权限？
当你在运行一个会读取或者写入USB设备的进程时，进程的用户/组必须有权限这么做。当然你可以手动用chmod命令改变USB设备的权限，但是手动的权限改变只是暂时的。USB设备会在下次重启时恢复它的默认权限。
![](https://farm6.staticflickr.com/5741/20848677843_202ff53303_c.jpg)
作为一个永久的方式，你可以创建一个基于udev的USB权限规则，它可以根据你的选择分配任何权限模式。下面是该如何做。
首先，你需要找出USB设备的vendorID和productID。使用lsusb命令。
$ lsusb -vvv
![](https://farm1.staticflickr.com/731/20848677743_39f76eb403_c.jpg)
上面lsusb的输出中，找出你的USB设备，并找出"idVendor"和"idProduct"字段。本例中,我们的结果是idVendor (0x067b)和 idProduct (0x2303)
下面创建一个新的udev规则。
$ sudo vi /etc/udev/rules.d/50-myusb.rules
----------
SUBSYSTEMS=="usb", ATTRS{idVendor}=="067b", ATTRS{idProduct}=="2303", GROUP="users", MODE="0666"
用你自己的"idVendor"和"idProduct"来替换。**MODE="0666"**表示USB设备的权限。
现在重启电脑并重新加载udev规则：
$ sudo udevadm control --reload
Then verify the permission of the USB device.
接着验证USB设备的权限。
![](https://farm1.staticflickr.com/744/21282872179_9a4a05d768_b.jpg)
--------------------------------------------------------------------------------
via: http://ask.xmodulo.com/change-usb-device-permission-linux.html
作者：[Dan Nanni][a]
译者：[geekpi](https://github.com/geekpi)
校对：[校对者ID](https://github.com/校对者ID)
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
[a]:http://ask.xmodulo.com/author/nanni