#!/usr/bin/env python3
import sys
import json

if len(sys.argv) < 3:
    print('USAGE: {} <dest-file> [src-files...]'.format(sys.argv[0]))
    exit(-1)

dest_path = sys.argv[1]
src_paths = sys.argv[2:]

dest = open(dest_path, 'r')
dest_data = json.load(dest)
dest.close()

for src_path in src_paths:
    src = open(src_path, 'r')
    src_data = json.load(src)
    dest_data += src_data
    src.close()

dest = open(dest_path, 'w')
json.dump(dest_data, dest, indent=4)
dest.close()