def runner_from_path(cmd, config):
    """Simple command line runner that expects a bash cmd in the PATH.

    This makes Picard tools back compatible with new approach of a single
    jar + bash script.
    """
    if cmd.endswith("picard"):
        return PicardCmdRunner(cmd, config)
    else:
        raise ValueError("Do not support PATH running for %s" % cmd)