How to exclude or not print previous found entries in script - perl

Question

Can someone shed some light on how to have my script kick off only if new entries are found for the current hour? Our logs are based in 00 01 02, etc.
When this runs it will look for any accounts specified within my for loop and send an email if this particular user made a cert change for the hour. If a match is found then everything is fine.
But I am interested only in new real-time entries which I can't figure out.
This will be run from a cron, and I can't have it repeating the same entry. I am new to Perl and can't seem to figure this out.
I have tried the File::Tail module and other CPAN mods but due to company policies some mods are not allowed.
#!/usr/bin/perl -w
use strict;
my $flag = 0;
my $few = shift || 1;
my $id;
my $newline;
my $partyId;
my $userid;
my $tid;
my $infile;
my #Takeraccounts = ( 'SCN', 'CX' );
my $mail_dest = 'xxxxx#cx.com';
my %TIME;
(
$TIME{SEC}, $TIME{MIN}, $TIME{HOUR}, $TIME{MDAY}, $TIME{MON},
$TIME{YEAR}, $TIME{WDAY}, $TIME{YDAY}, $TIME{ISDST}
) = localtime(time);
my $OLD_MIN = $TIME{MIN};
my $OLD_HOUR = $TIME{HOUR};
my $cmd = "cat /raid/logs/`date +%H`";
my $out_file = "/home/resource/certchange.txt";
open FF, "$cmd |";
open( OUT, ">> $out_file" ) || die "Cannot open $out_file"; # temp file to which to write the formated output
while ( <FF> ) {
my $line = $_;
#chomp ($now_time);
$line =~ s/\n/ /;
if ( /Updating cert/ .. /,permissions/ ) {
$newline = "$line";
if ( $line =~ /Updating cert.*updated by (\w+)/ ) {
$id = $1;
}
if ( $newline =~ /UPDATE.*id:(\w+).*partyId:(\w+),perm:/ ) {
$userid = $1;
$partyId = $2;
foreach (#Takeraccounts) {
if ( $partyId =~ /$_/ ) {
print OUT "Certificate cert Updated by $id for userid $userid, PartyID $partyId\n";
open ML, "| mutt -e\"set realname='Support'; set use_from=yes; set from='support\#cx.com'; set envelope_from=yes\" -s ' Alert! cert CHANGED' -i $out_file -- $mail_dest";
close ML;
}
}
}
}
}
close FF;
close(OUT);
unlink $out_file;