file transfer via `echo -ne`

echofile.py

#!/usr/bin/env python3

import argparse


parser = argparse.ArgumentParser()
parser.add_argument(
    "file", metavar="FILE", type=argparse.FileType("rb"),
    help="source file")
parser.add_argument(
    "output_name", metavar="OUTPUT-NAME", type=str,
    help="destination filename")
parser.add_argument(
    "-c", "--chunk-size", type=int, default=512,
    help="maximum size of each command after encoding")
args = parser.parse_args()


data = args.file.read()
prefix1 = f"echo -ne  >{args.output_name} '"
prefix2 = f"echo -ne >>{args.output_name} '"
suffix  = f"'"
chunk_size = (args.chunk_size - len(prefix2) - len(suffix)) // 4
for start in range(0, len(data), chunk_size):
    data_chunk = data[start:start + chunk_size]
    encoded_chunk = "".join("\\x{:02X}".format(byte) for byte in data_chunk)
    print((prefix1 if start == 0 else prefix2) + encoded_chunk + suffix)