If you want to reboot from the console using exactly the method as the power button:

http://www.internettablettalk.com/fo...17&postcount=3

(Granted, that command line is a bit on the long side but you could shorten it down with an alias or the like)

EDIT: Oops, that's for rebooting, here, this will shutdown:
run-standalone.sh dbus-send --system --type=method_call --dest="com.nokia.mce" --print-reply "/com/nokia/mce/request" com.nokia.mce.request.req_shutdown

Take that command line and look at http://repository.maemo.org/pool/dia...v_1.6.3.tar.gz if you want to do something else.