1、編寫需要執行的shell腳本：
// 大意：先殺掉進程，再清除日志，再重啟jar服務
echo "重啟webSocket" pidlist=`ps -ef |grep SystemCommunication |grep -v "grep"|awk '{print $2}'` kill -9 $pidlist rm $webSocket_home/nohup.out nohup /home/software/jdk1.8.0_221/bin/java -jar /home/SystemCommunication.jar > /home/utry/nohup.out &
2、設置定時任務：
crontab -e // 編輯Linux定時任務配置文件 05 16 * * * /home/webSocketStart.sh crontab -l // 查看當前所有的定時任務 05 16 * * * /home/webSocketStart.sh
3、查看定時任務日志：
tail -f /var/log/cron Oct 21 16:02:16 localhost crontab[12132]: (root) END EDIT (root) Oct 21 16:02:37 localhost crontab[12166]: (root) LIST (root) Oct 21 16:03:01 localhost crond[675]: (root) RELOAD (/var/spool/cron/root) Oct 21 16:03:01 localhost CROND[12249]: (root) CMD (/home/utry/webSocketStart.sh) Oct 21 16:04:01 localhost crontab[12392]: (root) BEGIN EDIT (root) Oct 21 16:04:22 localhost crontab[12392]: (root) REPLACE (root) Oct 21 16:04:22 localhost crontab[12392]: (root) END EDIT (root) Oct 21 16:05:01 localhost crond[675]: (root) RELOAD (/var/spool/cron/root) Oct 21 16:05:01 localhost CROND[12503]: (root) CMD (/home/utry/webSocketStart.sh) Oct 21 16:09:44 localhost crontab[12982]: (root) BEGIN EDIT (root) Oct 21 16:12:19 localhost crontab[12982]: (root) REPLACE (root) Oct 21 16:12:19 localhost crontab[12982]: (root) END EDIT (root) Oct 21 16:13:01 localhost crond[675]: (root) RELOAD (/var/spool/cron/root) Oct 21 16:14:07 localhost crontab[13419]: (root) BEGIN EDIT (root) Oct 21 16:14:38 localhost crontab[13419]: (root) REPLACE (root) Oct 21 16:14:38 localhost crontab[13419]: (root) END EDIT (root) Oct 21 16:14:41 localhost crontab[13456]: (root) LIST (root) Oct 21 16:15:01 localhost crond[675]: (root) RELOAD (/var/spool/cron/root)