Append garbage to files

append-garbage.sh

#!/bin/bash
usage()
{
        echo -e "Usage: $0 -i <input folder path containing files to append garbage> -b <garbage size>" \
        "\nExample Usage: ./append-garbage.sh -i ~/Pictures/000-large -b 10M" 1>&2; exit 1;
}
while getopts i:b: option
do
        case "${option}"
        in
                i) SOURCE_FOLDER=${OPTARG};;
                b) GARBAGE_SIZE=${OPTARG};;
                *) usage;;
        esac
done
dd if=/dev/zero of=garbage.dat  bs=$GARBAGE_SIZE  count=1
for FILE in $SOURCE_FOLDER/*
do
        cat garbage.dat >> $FILE
done
rm garbage.dat