import sys fname = sys.argv[1] start = int(sys.argv[2], 0) length = int(sys.argv[3], 0) with open(fname, 'rb') as f: f.seek(start) d = f.read(length) for i, b in enumerate(d): if b in (0x0c, 0x0d): print(hex(0x80000000 + start + i), hex(start + i), hex(b))