if(/
##
foreach my $file(@files){
open(TMP, '>/tmp/temp.html') || die "tmp file open failed:$!\n";
open(FILE, "$file") || die "source file open failed: $!\n";
while(){
s/(.+)<\/title>/$new_title<\/title>/i;
print TMP $_;
}
close(TMP);
close(FILE);
unlink($file);
rename('/tmp/temp.html', $file);
}