Update install_dev.sh

scripts/install_dev.sh

@@ -8,6 +8,8 @@ echo -e "您正在安装的是\033[31mmdserver-web测试版\033[0m，非开发
 echo -e "You are installing\033[31m mdserver-web dev version\033[0m, normally use install.sh for production.\n" 
 sleep 1
 
+LOG_FILE=/var/log/mw-install.log
+
 {
 
 if [ -f /etc/motd ];then
@@ -174,7 +176,7 @@ endTime=`date +%s`
 ((outTime=(${endTime}-${startTime})/60))
 echo -e "Time consumed:\033[32m $outTime \033[0mMinute!"
 
-} 1> >(tee mw-install.log) 2>&1
+} 1> >(tee $LOG_FILE) 2>&1
 
 echo -e "\nInstall completed. If error occurs, please contact us with the log file mw-install.log ."
 echo "安装完毕，如果出现错误，请带上同目录下的安装日志 mw-install.log 联系我们反馈."