$cat /proc/bus/usb/devices
cat: /proc/bus/usb/devices: 沒有此一檔案或目錄
方法一
$ sudo mount -t usbfs usbfs /proc/bus/usb/
保證usbfs是挂载在/proc/bus/usb上的
方法二
可以用lsusb命令查看,運行lsusb -v可以看到很多瑣碎資料
Usage: lsusb [options]...
List USB devices
-v, --verbose
Increase verbosity (show descriptors)
-s [[bus]:][devnum]
Show only devices with specified device and/or
bus numbers (in decimal)
-d vendor:[product]
Show only devices with the specified vendor and
product ID numbers (in hexadecimal)
-D device
Selects which device lsusb will examine
-t
Dump the physical USB device hierarchy as a tree
-V, --version
Show version of program
方法三
sudo mount --bind /dev/bus /proc/bus sudo ln -s /sys/kernel/debug/usb/devices /proc/bus/usb/devices