强制性扭曲示例：
twistd -n ftp
可能有用：
twistd ftp --helpUsage: twistd [options] ftp [options].WARNING: This FTP server is probably INSECURE do not use it.Options: -p, --port=set the port number [default: 2121] -r, --root=define the root of the ftp-site. [default: /usr/local/ftp] --userAnonymous= Name of the anonymous user. [default: anonymous] --password-file= username:password-style credentials database --version--help Display this help and exit.
