I would like to monitor at least the CPU and memory utilization (better average io actity) from the command line. I do not want to use anything graphical. ps - as far as I have seen - show me per-process counts, but I would like to see the overall system activity.
When I was last active in *nix (some 10 years ago
) there was a nice tool "sar" that did this job. So what is it called today ;-).