./shuffle.pl big1.txt >tmp && mv tmp big1.txt ./shuffle.pl big2.txt >tmp && mv tmp big2.txt ./shuffle.pl big3.txt >tmp && mv tmp big3.txt ./shuffle.pl long1.txt >tmp && mv tmp long1.txt ./shuffle.pl long2.txt >tmp && mv tmp long2.txt ./shuffle.pl long3.txt >tmp && mv tmp long3.txt