Script to auto-update USB path of printer for CUPSD container on UNRAID

update-cupsd-usb-bus.sh

#!/bin/bash

# define the name of cupsd container & printer
CONTAINER_NAME=cupsd
PRINTER_NAME='Seiko Epson Corp. L3110 Series'

# get bus and device number for Seiko Epson Corp. L3110 Series
bus_and_device=$(lsusb | grep -i "${PRINTER_NAME}" | awk '{print $2, $4}' | tr ':' ' ')

# extract bus and device numbers
bus_num=$(echo $bus_and_device | cut -d' ' -f1)
device_num=$(echo $bus_and_device | cut -d' ' -f2)

# generate new path
new_path="/dev/bus/usb/${bus_num}/${device_num}"

# update the config file
sed -i "s@/dev/bus/usb/[0-9]\{3\}/[0-9]\{3\}@${new_path}@g" /boot/config/plugins/dockerMan/templates-user/my-${CONTAINER_NAME}.xml