As mentioned, if you are going to talk Unix, command line commands, Terminal, etc..., you should post in the Mac OS X Technologies > Unix Forum
<http://discussions.apple.com/forum.jspa?forumID=735>
Or since you are talking Apple Remote Desktop, you may want to ask in the ARD forum
<http://discussions.apple.com/forum.jspa?forumID=1007>
NOTE: If you are indeed managing a classroom full of Mac, or managing Macs in a corporate environment, then ARD is most likely the tool you wish to use. However, we have seen individuals that just want to managed Mom's iMac and do not realize that they do NOT need to pay for an expensive ARD license, when there are less expensive remote access tools available for the home user (iChat Screen Sharing, MobileMe Back-to-My-Mac, TeamViewer.com, LogMeIn.com, home router port forwarding for ssh, VNC, AFP, etc...). Just want to make sure you are pursuing the right approach.
You might be asking about 'sudo', however, I would think ARD has built-in features for privileged access on the managed Macs (I'm guessing as I have never used ARD, but since it can install software it would need remote privileged access).
The problem with sudo is that you have to already have an admin account on each Mac you wish to invoke it, and you need to know the password for that account on each system. Seems awkward when managing multiple systems, which is another argument for ARD have a built-in solution.
It is possible to store an ssh-keygen created *.pub key in the /private/var/root/.ssh/authorized_keys files on the managed Macs so that you can ssh root@remote.mac.addr, which will of course give you full access to everything on that system (without needing to enable the root account).
Again, you may want to ask this question in either the ARD or the Unix forums. It might be helpful if you provided a few more details, such the environment where you will be managing the Mac(s), and what you wish to accomplish. You may get some ideas on how you might approach your problem.
