强制性扭曲示例：
twistd -n ftp
可能有用：
twistd ftp --help
Usage: 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.
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