"    Input:  {
               (path)     - starting path (or current)
               (pattern)  - file pattern
               (cmd)      - perform action with a file

               (ck)       - call CK access
               (file_key) - substitute this key in 'ck' with file name with full path
            }

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

"