I add an Action "Execute Script" and run a script file

Code:
1. Add "Execute Script" action
       Store process's stdout in : $MY_STDOUT$
       Store process's stderr in : $MY_STDERR$
       Store process's exit code in : $MY_EXITCODE$
2. Add "Output Debug Information" action, and write debug information to "MyLog.log"
In interactive mode, these variables ($MY_STDOUT$,$MY_STDERR$ and $MY_EXITCODE$) and their values can be found in MyLog.log.

But in silent mode, we can't get these output information in MyLog.log.
Our customers want to see the result of running script file in silent mode.

If any idea or solution?