Create qr codes with consecutive numbering and labels

qrcodegen.sh

#!/usr/bin/env bash

NUM_QR_CODES=80
DPI=300
TMP_DIR=qrtemp
W_GRID=$(echo "scale=0; sqrt(${NUM_QR_CODES}/sqrt(2))" | bc -l)
H_GRID=$(echo "scale=0; ${NUM_QR_CODES}/${W_GRID}" | bc -l)

# install dependencies
sudo apt-get -y install qrencode imagemagick

# create qr codes and add label
mkdir -p ${TMP_DIR}
for i in `seq 1 ${NUM_QR_CODES}`; do
	CURR_NUM=`printf "%.8d" $i`
	qrencode -l H -o ${TMP_DIR}/${CURR_NUM}.png -d ${DPI} -t png ${CURR_NUM} 
	convert ${TMP_DIR}/${CURR_NUM}.png label:"${CURR_NUM}" -gravity south -append ${TMP_DIR}/${CURR_NUM}.png
done

# align all qr codes gridwise on A4 paper
montage ${TMP_DIR}/*.png -tile ${W_GRID}x${H_GRID} qrcodes.pdf

# clean up
for i in `seq 1 ${NUM_QR_CODES}`; do
	CURR_NUM=`printf "%.8d" $i`
	rm -f ${TMP_DIR}/${CURR_NUM}.png
done
rm -rf ${TMP_DIR}