How to get load averages and compulsory memory from a script?

uptime piped to sed fixes the first part but what about memory usage? top runs, at least by default, interactively. So: I need to watch used RAM excluding opportunistic caching(which gets dropped as soon as the memory is needed). And ask about both because I expect a single standard tool can do it, instead of two. Or - even better - something in /proc indicating the RAM part.