As ulx wasn't itself written to be a library, we've never actually posted a document of commands within it.
We have however, published ULib, which ULX relies on.
http://ulyssesmod.net/docs/If you're wanting a 'chat like' message sent to admins, look up ulx.asay in our ulx files.
If you're wanting a 'log' like echo that only admins can see and is written to server logs, check out FancyLogAdmin (I think). Probably in logs.lua of ulx.
Our ULX code is commented reasonably well, and written in such a way that isn't obfuscated.
Variables are easy to understand, functions are too, etc.