lsUSB

#!/bin/bash
#
# lsUSB: a wrapper around lsusb to list USB devices, in a more tabular format and saliently
#        listing any TTY devices associated with a USB device. It's very tedious trying to 
#        find out the /de/vttyUSBn device assocated with a USB tty on Linux. This simply
#        automates the discovery process. Empirically developed (i.e. not with profound 
#        understanding of the relationship between USB devices and device files and the 
#        kernel etc. At time of parking htis, it does list tty devices against the hubs 
#        that USB ttys are plugged into too. That's liveable.
#
export PS4='+${BASH_SOURCE}:${LINENO}:${FUNCNAME[0]}: '


declare -A tty_map # Declare associative array

for dev_dir in /sys/bus/usb/devices/*; do
    if [[ -d "$dev_dir" ]]; then
        if [[ -f "$dev_dir/uevent" ]]; then
            busnum=$(grep -oP '(?<=BUSNUM=).+' "$dev_dir/uevent")
            devnum=$(grep -oP '(?<=DEVNUM=).+' "$dev_dir/uevent")

            if [[ ! -z "$busnum" && ! -z "$devnum" ]]; then
                tty_path=$(find "$dev_dir/." -name "tty" -print -quit)
                if [[ ! -z "$tty_path" ]]; then
                    tty_dev=$(ls "$tty_path")
                    # Extract bus and device from tty_path
                    dev_path=$(dirname "$tty_path")
                    if [[ -n "$tty_dev" ]]; then
                        tty_map["${busnum}:${devnum}"]="/dev/$tty_dev"
                    fi
                fi
            fi
        fi
    fi
done

format="%-3s %-6s %-14s %-8s %-9s %s"
printf "$format\n" "BUS" "DEVICE" "TTY" "VendorID" "ProductID" "Description" 

lsusb | while IFS= read -r line; do
  if [[ "$line" =~ Bus\ ([0-9]+)\ Device\ ([0-9]+):\ ID\ ([0-9a-fA-F]{4}):([0-9a-fA-F]{4})\ (.*) ]]; then
    bus="${BASH_REMATCH[1]}"
    device="${BASH_REMATCH[2]}"
    vendor="${BASH_REMATCH[3]}"
    product="${BASH_REMATCH[4]}"
    description="${BASH_REMATCH[5]}"

    key="${bus}:${device}"
    tty="${tty_map[$key]}"

    if [[ -z "$tty" ]]; then
      tty="None"
    fi

    printf "$format\n" "$bus" "$device" "$tty" "$vendor" "$product" "$description" # Formatted output
  else
    # Should never happen, if it does the regex that prses lsusb output above needs fixing.
    echo "ERROR Unhandled device: $line"
  fi
done