fix nginx shell script for sub

sub/start.sh

@@ -17,6 +17,7 @@ fi
 
 nohup /base/subconverter & echo "启动成功"
 
+init_nginx (){
   sed -i '$d' /etc/nginx/conf.d/default.conf
   sed -i '$d' /etc/nginx/conf.d/default.conf
   sed -i '$d' /etc/nginx/conf.d/default.conf
@@ -27,5 +28,10 @@ cat >> /etc/nginx/conf.d/default.conf <<EOF
     }
   }
 EOF
+}
+
+if [[ ! $(cat /etc/nginx/conf.d/default.conf | grep 25500) ]]; then
+	init_nginx
+fi
 
 nginx -g "daemon off;"