Sudo su

If this is not the correct forum to ask this question I apologize .
I have set up my system in that I am admin.
But still if try to update or something like that it ask me for my password with is good.
But if I open a terminal and give the command sudo su enter and than whoami the answer is root.
That means that I can do anything on the command line without entering a password .
I find that strange .
Can I change it in that way that it ask for a password before I become root ?

Tanks in advance
dobby

I'm no master of the UNIX shell, but I think it's telling you that you're root because you prefaced "su" with sudo. When you run anything under sudo, you're root - and you have to authenticate the first time you do it. You'll find that if you don't preface something with sudo, you're an every day user.

the command su will automatically assume root user if you do not specify a user. This is true of all *nix's out there. If you had done something like..

sudo foouser

you'd get
mikeMbp:Caches mike$ whoami
foouser

If you want to run as a non-priv'd user and run priv'd commands don't su, there's no reason to (su is Switch User). Just sudo <command>. Once you're root the OS assumes you're ALWAYS right. Which has gotten a lot of people in trouble Even most unix admin's won't log in as root without reason.. it's too easy to fingercheck.