QR code test

#!/bin/bash

generuj() {
for i in {1..4}; do
    POCET_ZNAKU=$(($i * 50))
    echo $POCET_ZNAKU
    STRING=`cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w $POCET_ZNAKU | head -n 1`
    qrencode --8bit -l $1 -o "qrcode_$1__$POCET_ZNAKU.png" $STRING
done
}

generuj "M"
generuj "H"