Jonathan, sounds like a path problem. Default directory in OS X for sudo is /usr/bin. To verify:
which sudo
Try it:
/usr/bin/sudo sh
If that work, you'll need to modify your path. If you're using the bash shell (default, I believe), open ~/.bashrc, look for "PATH", and add /usr/bin to it.
Of course, if it's not a path problem, none of this will matter. Have to start somewhere though.
--Brian
Installing and upgrading help
I lost my sudo
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