i need to make a command that ...

[Gribouillis]

Here is one. You can improve it with argparse to include the --help option.

import sys

BUFSIZE = 1024

def main():
    while True:
        s = sys.stdin.read(BUFSIZE)
        if not s:
            break
        sys.stdout.write(repr(s)[1:-1])
        sys.stdout.flush()

if __name__ == '__main__':
    main()