#!/usr/bin/env bash

[ ${#@} -ne 2 ] || { echo "Usage: $0 <loginfile> <passwordfile>" >&2; exit 1; }

DELIM=';'
IFS=",$IFS"

exec 3<$1
exec 4<$2

while read -u 3 l && read -u 4 p; do
    logins=(${logins[@]} $l)
    passwords=(${passwords[@]} $p)
done
for ((i=0; i<${#logins}; i++)); do
    echo "${logins[$i]}${DELIM}${passwords[$i]}"
done

3<&-; 4<&-