2025-07-18 ...before ...ibancheck20250606.sh

#!/bin/bash

# (C) David Vajda
# IBAN Check
# 2025-06-06

i=3
A=(echo $*)
y=0
x=$(("${A[$i]}"))
while [ $i -lt $(($#)) ]
do
    echo "$x, $y, $z, ${A[$i+1]}"
    y=$(($x%97))
    echo "$y"
    z=$((($y*100)+${A[$i+1]}))
    echo "$z"
    x=$z
    i=$(($i+1))
done
x=$(($x%97))

echo "$((98-$x))"