First, run lsusb to list the USB devices on the system. You'll get something like the following:
# lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hubThen, run it with the bus and device numbers of the device you want information for... for example, in my case of the Logitech webcam (there's a lot more to it, but I truncated to fit here ~ you may want to output it to a file):
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 003: ID 046d:082d Logitech, Inc.
Bus 006 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 007 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 006 Device 002: ID 2109:0811
# lsusb -D /dev/bus/usb/001/003
Device: ID 046d:082d Logitech, Inc.
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 239 Miscellaneous Device
bDeviceSubClass 2 ?
bDeviceProtocol 1 Interface Association
bMaxPacketSize0 64
idVendor 0x046d Logitech, Inc.
idProduct 0x082d
bcdDevice 0.11
iManufacturer 0
iProduct 2 HD Pro Webcam C920
iSerial 1 2D62DFDF
bNumConfigurations 1