As an alternative to what Herbert suggested, you can just edit /etc/motd and put whatver you like there
It is intended to give a (brief, hopefully) message to people when they login. If you have update_motd set to YES in rc.conf (or do not have it there at all, YES is the default) then at each boot the first line of /etc/motd is made to contain the system version string (by the auto run at startup of /etc/rc.d.motd ... Herbert just suggester doing it manually). kre
