If, like me, you’ve been running DragonFly for a long time, and you haven’t switched away from tcsh for your account or for root, you may not have ‘set autorehash’ in your .cshrc.  Newer installs have it.

Put that into .cshrc if you don’t have it, and it’ll save 15 seconds of the rest of your life not typing ‘rehash’… assuming you can overcome the muscle reflex.