vim tomcatStart.sh

#!/bin/bash
/etc/profile
tomcatPath="/usr/local/tomcat9"
binPath="$tomcatPath/bin"
echo "[info][$(date)]正在监控tomcat，路径：$tomcatPath"
pid=`ps -ef | grep tomcat | grep -w $tomcatPath | grep -v 'grep' | awk '{print $2}'`
if [-n "pid"]; then
echo "[info][$(date)]tomcat进程为：$pid"
echo "[info][$(date)]tomcat已经启动，准备使用shutdown命令关闭"
$binPath"/shutdown.sh"
sleep 2
pid=`ps -ef | grep tomcat | grep -w $tomcatPath | grep -v 'grep' | awk '{print $2}'`
if [-n "$pid"]; then
echo "[info][$(date)]使用shutdown关闭失败，准备kill进程"
kill -9 $pid
echo "[info][$(date)]kill进程完毕"
sleep 1
else
echo "[info][$(date)]使用shutdown关闭成功"
fi
else
echo "[info][$(date)]tomcat未启动"
fi
echo "[info][$(date)]准备启动tomcat"
$binPath"/startup.sh"

sudo chmod 777 tomcatStart.sh

crontab -e
// 第一个是 tomcatStart.sh 的路径， 第二个是将日志输出到某个文件中
00 03 * * * /usr/local/tomcat9/bin/tomcatStart.sh  /home/zhang/tomcatLog.txt

systemctl restart crond