Here's another common problem which is trivially solved
   by Tie::File. How do I add a new record at the beginning
   of a file instead of at the end?

        unshift @lines, $new;   # Or add more than one record

##</code><code>##

####################
sub update_threads() {

my $parent = $_[0];
my $msg_id = $_[1];
#check if this is a top-level, and set $parent accordingly
if ($parent eq 'top') {
	$parent = $msg_id
}


my $main_threads_file = $htdocs . $path_info . "/threads.html";
my $archive_threads_file = $htdocs . $path_info . "/posts/" . $date . "threads.html";
my $post_location = $path_info . "/posts/" . $date . "/" . $parent . "_" . $msg_id . ".html";
my $post_name = $parent . "_" . $msg_id;
my @threads;
my @archive;
my $link = "<li> <!-- mid=\"$post_name\" --> <a href=\"$post_location\">" . $params{"subject"} . "</a> by " . $params{"name"} . "  <font size=\"-1\">on " . $time . "</font>";

tie @threads, 'Tie::File', $main_threads_file or syslog('err', "update_threads couldn't open file: $main_threads_file");

if ($parent == $msg_id) {
	unshift @threads, $link;
}


untie @threads;

return;

} ## end sub update_threads()	
#***************************

##</code><code>##

main::get_date() called too early to check prototype at
 /usr/local/apache/cgi-bin/bthreads-perl line 50.
main::read_config() called too early to check prototype at
 /usr/local/apache/cgi-bin/bthreads-perl line 53.
main::print_postform() called too early to check prototype
 at /usr/local/apache/cgi-bin/bthreads-perl line 63.
main::read_mcount() called too early to check prototype at
 /usr/local/apache/cgi-bin/bthreads-perl line 90.
main::get_date() called too early to check prototype at 
/usr/local/apache/cgi-bin/bthreads-perl line 92.
main::generate_post() called too early to check prototype at
 /usr/local/apache/cgi-bin/bthreads-perl line 95.
main::update_threads() called too early to check prototype
 at /usr/local/apache/cgi-bin/bthreads-perl line 98.
main::get_date() called too early to check prototype at
 /usr/local/apache/cgi-bin/bthreads-perl line 50.
main::read_config() called too early to check prototype at
 /usr/local/apache/cgi-bin/bthreads-perl line 53.
main::print_postform() called too early to check prototype
 at /usr/local/apache/cgi-bin/bthreads-perl line 63.
main::read_mcount() called too early to check prototype at
 /usr/local/apache/cgi-bin/bthreads-perl line 90.
main::get_date() called too early to check prototype at
 /usr/local/apache/cgi-bin/bthreads-perl line 92.
main::generate_post() called too early to check prototype at
 /usr/local/apache/cgi-bin/bthreads-perl line 95.
main::update_threads() called too early to check prototype
 at /usr/local/apache/cgi-bin/bthreads-perl line 98.
Use of uninitialized value in read at 
/usr/lib/perl5/5.6.1/Tie/File.pm line 699.
Use of uninitialized value in read at 
/usr/lib/perl5/5.6.1/Tie/File.pm line 699.
Use of uninitialized value in read at 
/usr/lib/perl5/5.6.1/Tie/File.pm line 699.
Use of uninitialized value in read at 
/usr/lib/perl5/5.6.1/Tie/File.pm line 699.
Use of uninitialized value in read at 
/usr/lib/perl5/5.6.1/Tie/File.pm line 699.
Use of uninitialized value in read at 
/usr/lib/perl5/5.6.1/Tie/File.pm line 699.
Use of uninitialized value in read at 
/usr/lib/perl5/5.6.1/Tie/File.pm line 699.
Use of uninitialized value in read at 
/usr/lib/perl5/5.6.1/Tie/File.pm line 699.
Use of uninitialized value in read at 
## and so on