<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def filename_command():
 """ Executor for `globus config filename` """

    try:
        config = get_config_obj(file_error=True)
    except IOError as e:
        safeprint(e, write_to_stderr=True)
        click.get_current_context().exit(1)
    else:
        safeprint(config.filename)