linux jar 包启动脚本

#1.获得jar的进程号
PID=$(ps -ef|grep system.jar | grep -v grep | awk '{print $2}')
#2，启动myjar的函数
start(){
nohup java -Xms4096m -Xmx4096m -XX:+UseG1GC -XX:MaxGCPauseMillis=200 -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/log/app-heap.dump -jar system.jar >/dev/null 2>&1 &
echo "start success"
}
#3，判断1中获取的PID是否存在，即判断myjar有没有启动
if [ -z "$PID" ]
then
#4，日志
echo "Sart the services directly "
#5,myjar之前没有启动的话,这里直接调用start函数
start
else
#6,myjar之前启动过且进程依然存活，则kill掉，然后调用start函数
echo "kill the existing myjar process firstly."
kill -9 $PID
echo " $PID has been killed"
start
fi