Bash script to thrash disk

disk_thrash.bash

#!/bin/bash

T=$(tempfile)
time sudo find /usr -type f| sort -R | head -n 4000 | sed -e "s/\ /\\\ /g" > $T
rm -f rand.files

I=0
FILES=""
cat $T | while read file; do
  if [ $I -lt 25 ]; then
    FILES="$FILES $file"
    I=$[${I}+1]
  else
    echo "$FILES"
    I=0
    FILES=""
  fi
done >> rand.files

cat rand.files | sort -r | while read file; do
  taskset -c 0 md5sum ${file} & </dev/null;
done

echo LAUNCHED