优化了一下别人写法，code如下
# ! /bin/sh
SERVICE_PATH="/data/www/ec"
SERVICE_NAME="go-mysql-sync"
START_CMD="./$SERVICE_NAME -config=river.toml"
LOG_FILE="restart.log"
cd $SERVICE_PATH
pwd
while true
do
procnum=`ps -ef|grep $SERVICE_NAME|grep -v grep|wc -l`
if [ $procnum -eq 0 ]
then
echo "start service...................."
echo `date +%Y-%m-%d` `date +%H:%M:%S` $SERVICE_NAME >>$LOG_FILE
${START_CMD}
fi
sleep 1 //每秒检查一轮
done
最后nohup 运行这个shell
nohup ./elastic.sh >/dev/null 2>&1 &
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