launch a properly passed through shell command in python

subprocess-passthru.py

    cmd = []
    env = os.environ.copy()
    p = subprocess.Popen(
        cmd, env=env, cwd=os.path.realpath(os.curdir), stdin=sys.stdin, stderr=sys.stderr, stdout=sys.stdout
    )
    
    # Attach all signals and forward them to the subprocess
    def sighandler(signum, stack):
        p.send_signal(signum)

    for i in [x for x in dir(signal) if x.startswith("SIG")]:
        try:
            signum = getattr(signal, i)
            signal.signal(signum, sighandler)
        except (OSError, RuntimeError, ValueError) as m:  # OSError for Python3, RuntimeError for 2
            #print("Skipping {}".format(i))
            pass
    p.wait()

    sys.exit(p.returncode)