If the goal is to answer in the affirmative for any prompt, try this instead.

 $telnet->cmd("echo y | /opt/bea/tuxedo8.1/bin/tmloadcf  GPPconfig.ubb
+");
[download]

In Unix, those responses are expected in STDIN, so you can pre-answer those questions by usually just piping a response into a pipe. I don't have tuxedo so I didn't try this, but I'm fairly certain it'll work for you.

Hope this helps.