add-nbo syntax : add-nbo sample : add-nbo a.bin c.bin example echo -n -e \\x00\\x00\\x03\\xe8 > thousand.bin echo -n -e \\x00\\x00\\x01\\xf4 > five-hundred.bin ./add-nbo thousand.bin five-hundred.bin 1000(0x3e8) + 500(0x1f4) = 1500(0x5dc)