#!/bin/bash

while [ -n "$1" ]
do
case "$1" in
    --input_folder)
        inp_fold=$2
        ;;
    --extension)
        ext=$2
        ;;
    --backup_folder)
        back_fold=$2
        ;;
    --backup_archive_name)
        arch_name=$2
        ;;
esac
shift
shift
done

mkdir $back_fold
cmp=1
for file in $(find "$inp_fold" -name "*.$ext")
do
    file_name=$(basename $file)
    cp $file "$back_fold/($cmp)$file_name"
    (( cmp++ ))
done
tar -Pczf $arch_name $back_fold
echo done