> I just found out that it is installed - in /usr/pkg/bin. > And this is on the PATH. > > So i don't understand what is happening - if I specify the full path, > the command responds with a help screen. > > Is there something special about the PATH for root on DragonFly (I've > just discovered I can simply type mysqladmin on a user account, and it > works fine)?
C shell behaviour. Using tcsh, type "rehash" so it will rebuild its internal table of contents of your path. The reason it worked on the other account, I assume, is that you logged into that after it was newly installed.