Don' t remove the target folder with option "rm", empty it instead

I don't think to remove the target folder and then recreate it is a good idea, consider empty the sub-files and sub-folders in the target folder.

I think this could avoid some problems like docker's mounting

No file or test is named. Start by locating the implementation of the rm option and trace how it handles the target folder; confirm the current behavior and how Docker mounting is affected. Done means the target folder remains in place while its contents are emptied, with coverage for the changed behavior.

Written by the indexing model from the issue text.