Convert UTF8-to-ASCII-to-UTF8

#!/bin/sh
## Convert strange characters to known ones.

#set -x

if [ $# -ne 2 ]
then
    echo "Usage: $0 src_file dst_file"
    exit 1
fi

find_chars=("é" "É" "è" "ê" "ë" "ô" "à " "â" "ç" "Ç" "ù" "û" "î" "ï")
rplc_chars=("é"  "É"  "è"  "ê"  "ë"  "ô"  "à"  "â"  "ç"  "Ç"  "ù"  "û"  "î"  "ï")

num_chars=${#find_chars[@]}

if [ $num_chars -ne ${#rplc_chars[@]} ]
then
    echo "There must be as many items in both arrays"
    exit 1
fi

cp $1 $2

for (( i=0; i<= $((num_chars - 1)); i++ ))
do
    find_chr="${find_chars[$i]}"
    rplc_chr="${rplc_chars[$i]}"
    echo "Replacing ${find_chr} to ${rplc_chr}..."
    sed -i "s/${find_chr}/${rplc_chr}/g" $2
done