[root@station13 Desktop]# su - student

[student@station13 ~]$  ps axo command,nice,pid | grep \'sleep 777\'

sleep 777                   -19  3071

grep sleep 777                0  3157

[student@station13 ~]$ renice 0 3071

renice: 3071: setpriority: Operation not permitted

[root@station13 Desktop]# renice -10 3071

3071: old priority -19, new priority -10

[root@station13 Desktop]# su - student