<requires error-cvm>
auth $cvm printenv '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
SERVICE=ftp
530 Authentication failed.^M
