I've been doing some research on increasing the priority of certain programs, most places I go to bring up these "renice" commands. Stuff like "sudo renice # PID" or "renice -n # -p PID". I enter my priority # and PID, yet none of these commands work at all. No indication, not even an error message. I enter the command and nothing happens. I'm thinking that with new updates and stuff these commands don't work anymore. Any help?