4x6 inch label printer - pdf watch folder - on ubuntu, with lprint

label-print.service

# This is a user land systemd service. Put it in your ~/.config/systemd/user/ folder
# Then:
# systemctl --user enable ebay-label-print.service 
# systemctl --user restart ebay-label-print.service 
# journalctl -f | grep label-print

[Unit]
Description=4x6 inch label printer - pdf watch folder - on ubuntu, with lprint
After=network.target 


[Service]
Type=simple
Restart=on-failure
RestartSec=3
PrivateTmp=true
# NoNewPrivileges=true
# NoNewPrivileges=false
ExecStart=/path/to/listen-folder-ebay-label-print-pdf.sh
ExecReload=/bin/kill -HUP $MAINPID

[Install]
WantedBy=default.target

listen-folder-ebay-label-print-pdf.sh

#!/bin/bash

# enable shell trace debugging
set -x

# This script is optimized for ebay 4x6 inch pdf labels
# It requires the commands 'convert' from imagemagick and 'inotifywait' from inotify-tools
# 'sudo apt install -y inotify-tools'




# watch folder location
_listen_path="/home/YOUR_USER_NAME/PATH/TO/WATCH/FOLDER"


run_lprint_server()
{
	lprint server
}


_ebay-label-convert-pdf-to-png()
{
  _input_pdf="$1"
  _output_png="${1}.png"
  convert -density 320 "$_input_pdf" -scale 926x1463 -type grayscale -depth 8 -crop 812x1218+52+166 "$_output_png"
  echo "saved $_output_png"
}

ebay-label-print()
{
  _input_pdf="$1"
  _output_png="${1}.png"
  _ebay-label-convert-pdf-to-png "$_input_pdf"
  lprint -o media-top-offset=3.5mm -o print-color-mode=bi-level -o media-tracking=continuous -o media-type=labels-continuous -o media=oe_4x6-label_4x6in -o orientation-requested=portrait "$_output_png"
}

print-pdf-folder-listen()
{
	mkdir -p "$_listen_path"
	cd "$_listen_path"
	inotifywait -m "$_listen_path" -e create -e moved_to |
	    while read path action file; do
	        echo "The file '$file' appeared in directory '$path' via '$action'"

	        if [ "$file" != "${file%pdf}" ]; then
		        # do something with the file
		        ebay-label-print "$file"
		        rm -rf "$file" "$file.png"
		    fi
	    done
}


run_lprint_server &


print-pdf-folder-listen