shell programming challenge

[Adam Fabian]

It's possible to generate temporary files in a secure manner; there's
probably something in the ports collection to generate good, random
file names.  I'm not sure I'd go to so much trouble to avoid using
a file for --init-file or --rc-file.

That aside, you could try using expect to script the bash session.

-- 
Adam Fabian (afabian at austin.rr.com)