<requires bad-cvm>
auth $cvm 'printf Help!' 'USER username' 'PASS password'
<result>
220-TwoFTPd server ready.^M
220 Authenticate first.^M
twoftpd-auth[PID]: USER username
331 Send PASS.^M
twoftpd-auth[PID]: PASS XXXXXXXX
530 Authentication failed.^M
