...functions may operate on all members of a process group, including kill (2), killpg (3), getpriority (2), setpriority (2), ioprio_get (2), ioprio_set (2), waitid (2), and waitpi…...ds). nice (2) Set a new nice value for the calling thread, and return the new nice value. getpriority (2) Return the nice value of a thread, a process group, or the set of threa…