if($mech->mirror("url","$filename") == RC_NOT_MODIFIED ) {
                print " link not Updated \n\n\n";
                if($mech->response()->is_success){
                        print " response is success\n\n";
                        print " content :",$mech->response()->as_string,"\n\n";
                }
                else {
                        print "failure \n\n";
                }
 }
 else {
     print " link updated...\n\n";
     $mech->save_content($filename);
 }

##</code><code>##

# Command line output error

Cannot rename '-23348' to '': No such file or directory

$ls 

-23094  -23348  code.pl  config.ini  downloads  downloads1  downloads2  Download_Status.doc  output.txt

$ ls ./* -lthr


 727 May 26 09:41 ./config.ini
 9.2K May 26 09:54 ./code.pl
 11M May 26 09:54 ./-23094
 113 May 26 09:55 ./Download_Status.doc
 26M May 26 10:04 ./-23348