*BSDThis forum is for the discussion of all BSD variants.
FreeBSD, OpenBSD, NetBSD, etc.
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Following hitest's advice above does not start a GUI on startup. If you followed the link and enabled a display manager such as kdm4 or gdm and now decided that you don't want it, just undo or comment out whatever you did to /etc/rc.conf
With FreeBSD only users who are members of the wheel group may "su".
You will need to login as root and edit /etc/group and add user huamin to that group (like: wheel:*:0:root,huamin). Then huamin may "su".
As others have indicated, it is very much worthwhile to spend a few hours reading through the FreeBSD Handbook. I am a FreeBSD newbie myself, but what I have learned came mostly from that and the man pages and a few Ports makefiles.
Typical UNIX su requires the wheel group by default. GNU su does not require it for purely ideological reasons (explained by RMS).
I am surprised that I was unaware of this particular RMS-ism (or had forgotten it), but had recently found this difference between GNU/Linux and and FreeBSD. The man is fully committed to his cause - I admire that! Thanks for contributing to my own knowledge base!