$from = 0;
$to = 1000;

Only 500 entries are got in the file and the it prints from 
<code>
[ 3] Processesing file200
[ 3] Processesing file201
[ 3] Processesing file202
....
[ 3] Processesing file220


[ 3] Processesing file299
[ 5] Processesing file400
[ 5] Processesing file401
[ 5] Processesing file498
[ 5] Processesing file499
[ 1] Processesing file  0
[ 1] Processesing file  1
[ 1] Processesing file  2
..
[ 1] Processesing file 99
[ 2] Processesing file100
[ 2] Processesing file101
[ 2] Processesing file102
[ 2] Processesing file103
[ 2] Processesing file104
[ 2] Processesing file105
..
[ 2] Processesing file198
[ 2] Processesing file199
[ 4] Processesing file300
[ 4] Processesing file301
......
[ 4] Processesing file397
[ 4] Processesing file398
[ 4] Processesing file399