rlimit is a program that lets you run processes with system resource limits set. It can be used by software developers and testers to test that software will run correctly in resource restricted environments. It is also useful for software which would otherwise consume excessive resources such as programs that used 100% CPU, set their own priority levels, or consume too much memory. This is basically a command line interface to the system functions getrlimit() and setrlimit().
playerdo is a script for controlling a variety of different media players from a single command line interface. It is intended to be used with keyboard shortcuts, especially the media keys (play/pause, next, etc.) found on many keyboards. It automatically detects which media player is running and tries to do the right thing.