output=cmdExport.Flag.String("o","","output tar file name, must ends with .tar, or just a \"-\" for stdout")
format=cmdExport.Flag.String("fileNameFormat",defaultFnFormat,"filename formatted with {{.Mime}} {{.Id}} {{.Name}} {{.Ext}}")
newer=cmdExport.Flag.String("newer","","export only files newer than this time, default is all files. Must be specified in RFC3339 without timezone")
newer=cmdExport.Flag.String("newer","","export only files newer than this time, default is all files. Must be specified in RFC3339 without timezone, e.g. 2006-01-02T15:04:05")