Thanks for suggesting the solution ...I got the script working ...

use CGI;
my $html= new CGI;
my $file= $html->param('a');
my $filepath= "/var/www/upload/$file";

print ("Content-Type:application/x-download\n");
print "Content-Disposition: attachment; filename=$file\n\n";

open FILE, "< $filepath" or die "can't open : $!";
binmode FILE;
local $/ = \10240;
while (<FILE>){
    print $_;
}

    close FILE;
#unlink ($filepath);
[download]