(1) user = tcsh
(2) root = csh
(3) script = sh
(1),(2) reason: http://www.freebsd.org/doc/handbook/install-post.html, and page 4 of this thread (January 5th, 2011, 22:53), by UNIXgod: reference to chapter 7.10 FAQbook.
(3) reason: http://www.kitebird.com/csh-tcsh-book/csh-whynot.