As your first command, before you scan for the prompt, set their prompt; just send 
PS1='$'
export PS1
But you don't know for sure what shell they'll have, so why not start up the one you want? 
exec env PS1='$' /bin/bash
You might want to set their path, too, to make sure you're really running the program you expect to be. In fact, why not clear out their current environment and start up bash without reading their .bashrc or .profile at all? 
exec env - PS1='$' PATH=/usr/bin:/bin /bin/bash --norc --noprofile

In reply to Re: Net::Telnet stalls by sgifford
in thread Net::Telnet stalls by JoeJaz

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