"    Input:  {
              path                  - top level path
              (file_name)           - search for a specific file name
              (pattern)             - return only files with this pattern
              (path_ext)            - path extension (needed for recursion)
              (can_be_dir)          - if 'yes', return matched directories as well
              (recursion_level_max) - if >0, limit dir recursion
            }

    Output: {
              return       - return code =  0, if successful
                                         >  0, if error
              (error)      - error text if return > 0

              list         - list of found files
            }
"