#!/bin/bash

if [ -z "$2" -o ! -r "$1" ]; then
  echo "Usage: mince [file] [chunk size]"
  exit 255
fi

SIZE=`ls -l $1 | tr -s 'a-zA-Z -' ' ' | cut -f 3 -d ' '`
echo "size = $SIZE"

if [ $2 -gt $SIZE ]; then
  echo "Your chunk size must be smaller than the file size!"
  exit 254
fi

CHUNK=$2
TOTAL=0
PASS=0
while [ $TOTAL -lt $SIZE ]; do
  PASS=$((PASS + 1))
  echo "Creating $1.$PASS..."
  dd conv=noerror if=$1 of=$1.$PASS bs=$CHUNK skip=$((PASS - 1)) count=1 2> /dev/null
  TOTAL=$((TOTAL + CHUNK))
done

echo "Created $PASS chunks out of $1."