python split_file.py -n <file-name> -s <number>
python split_file.py -n file.json -s 2
<x1,x2,...,xn> is set of numbers seprated with ','
python split_file.py -n <file-name> -s <number> -f <x1,x2,...,xn>
python split_file.py -n file.json -s 2 -f 1,2,7