I have a problem with su command too!
im on dedicated FreeBSD 4.10-RELEASE server.today i got problem with using command su - or su $username.i get msg: su -
anyone can tell me the problem.
what is the output of "which su"? Should be /usr/bin/su. Another thing may be the home directory of the user you're trying to su to is bad somehow (but unlikely...). This is an odd error.