debian:/etc/hotplug# lsusb
Bus 004 Device 001: ID 0000:0000  
Bus 003 Device 001: ID 0000:0000  
Bus 002 Device 001: ID 0000:0000  
Bus 001 Device 001: ID 0000:0000  
debian:/etc/hotplug# 
debian:/etc/hotplug# lsusb -t
Bus#  4
`-Dev#   1 Vendor 0x0000 Product 0x0000
  |-Dev#   2 Vendor 0x0409 Product 0x0059
  | `-Dev#   6 Vendor 0x0409 Product 0x0059
  |   |-Dev#   7 Vendor 0x0b95 Product 0x7720
  |   |-Dev#   8 Vendor 0x067b Product 0x2305
  |   |-Dev#   9 Vendor 0x067b Product 0x2303
  |   `-Dev#  10 Vendor 0x0d8c Product 0x0006
  `-Dev#   3 Vendor 0x0204 Product 0x6025
Bus#  3
`-Dev#   1 Vendor 0x0000 Product 0x0000
  `-Dev#   3 Vendor 0x05e3 Product 0x0604
    |-Dev#   4 Vendor 0x045e Product 0x0040
    |-Dev#   5 Vendor 0x03f0 Product 0xb202
    `-Dev#   6 Vendor 0x058f Product 0x6362
Bus#  2
`-Dev#   1 Vendor 0x0000 Product 0x0000
  `-Dev#   3 Vendor 0x413c Product 0x8000
Bus#  1
`-Dev#   1 Vendor 0x0000 Product 0x0000
debian:/etc/hotplug#