diff --git a/std-script/run b/std-script/run
--- a/std-script/run
+++ b/std-script/run
@@ -111,7 +111,7 @@
   result_file.write run_stat.strip 
   result_file.write "\n"
   result_file.close 
-  `rm run_result`
+  FileUtils.rm "run_result"
   # `rm output.txt`   --- keep the output
 
   comment_file.write comment