# stat.shの情報確認
$ ps -p 492 -o pid,tty,cls,ni,pri,rtprio,cmd
    PID TT       CLS  NI PRI RTPRIO CMD
    492 ttyS0     TS   0  19      - /bin/sh ./stat.sh
$ chrt -p 492
    pid 492's current scheduling policy: SCHED_OTHER
    pid 492's current scheduling priority: 0

# nice値を19に変更
$ renice -n 19 -p 492
    492 (process ID) old priority 0, new priority 19

$ ps -p 492 -o pid,tty,cls,ni,pri,rtprio,cmd
    PID TT       CLS  NI PRI RTPRIO CMD
    492 ttyS0     TS  19   0      - /bin/sh ./stat.sh
$ chrt -p 492
    pid 492's current scheduling policy: SCHED_OTHER
    pid 492's current scheduling priority: 0

# nice値を-6に変更
$ renice -n -6 -p 492
    492 (process ID) old priority 19, new priority -6

$ ps -p 492 -o pid,tty,cls,ni,pri,rtprio,cmd
    PID TT       CLS  NI PRI RTPRIO CMD
    492 ttyS0     TS  -6  25      - /bin/sh ./stat.sh
$ chrt -p 492
    pid 492's current scheduling policy: SCHED_OTHER
    pid 492's current scheduling priority: 0

# スケジューリングポリシーをFIFO、静的優先度を99に変更
$ chrt -f -p 99 492

$ ps -p 492 -o pid,tty,cls,ni,pri,rtprio,cmd
    PID TT       CLS  NI PRI RTPRIO CMD
    492 ttyS0     FF   - 139     99 /bin/sh ./stat.sh
$ chrt -p 492
    pid 492's current scheduling policy: SCHED_FIFO
    pid 492's current scheduling priority: 99

# スケジューリングポリシーをRR、静的優先度を1に変更
$ chrt -rr -p 1 492

$ ps -p 492 -o pid,tty,cls,ni,pri,rtprio,cmd
    PID TT       CLS  NI PRI RTPRIO CMD
    492 ttyS0     RR   -  41      1 /bin/sh ./stat.sh

    pid 492's current scheduling policy: SCHED_RR
    pid 492's current scheduling priority: 1
