Shell script to split file for multipart upload

split_file.sh

#!/bin/bash

FILE=$1
FILESIZE=$(stat -c%s "$FILE")

BLOCK_SIZE=10000

BLOCKS=$(((FILESIZE + (BLOCK_SIZE + 1)) / BLOCK_SIZE))

echo "$FILESIZE"
echo "$BLOCKS"

for (( block = 0; block < $BLOCKS; block += 1 ))
do 
    echo $block;
    START_RANGE=$((block*BLOCK_SIZE))
    END_RANGE=$((((block +1) * BLOCK_SIZE) - 1))
    if [ "$block" -eq  $((BLOCKS-1)) ]
    	then
    	END_RANGE=$FILESIZE
    fi
    echo "$START_RANGE : $END_RANGE"
    dd if=$FILE skip=$block bs=$BLOCK_SIZE count=1  status=noxfer 2> /dev/null  > "files/img$block"
done