add_usb() {
  echo '** USB devices:' >&3
  if command -v lsusb >/dev/null; then
    lsusb >&3
  else
    echo 'not available' >&3
  fi
  echo >&3
}

ask_usb() {
  # This information shouldn't vary much between kernel versions, so
  # include it anyway.
  test $same_system = nop || add_usb 
}