Process bulk output files

```
If one command/procedure output a bulk of files (usually in a directory), it is 
not easy to find out the exact output file name.

Now the workaround way is setting output as one of those files.

There should be a better way to describe this.
```

Original issue reported on code.google.com by `pku.ya...@gmail.com` on 22 Dec 2012 at 1:23
