#!/bin/bash

dd if=/dev/random of=scrub.0 count=4 bs=1040

df -h .

i=10
while [ $i -gt 0 ]
do
  cat scrub.0 scrub.0 >> scrub
  cat scrub scrub >> scrub.0
  let i=i-1
done

i=0 ; j=1

while true
do
  dd if=/dev/random of=scrub.$j bs=200 count=1
  dd if=scrub.$i bs=32k >> scrub.$j || break
  let i=i+1 j=j+1
done

df -h .
 
rm scrub.?  scrub
 
df -h .
 
rm scrub.*
 
df -h .