Greetings xmerlin,

In your example, you have the entire log file getting loaded into @lines all at once. If your log file is especially large, you'll run out of memory. What you probably want instead is to only look at a single line in the file at a time.

my @log;
if (-e $logfile) {
    open(LOG, '<', $logfile) or die $!;
    while (<LOG>) {
        push @log, {
            logLine => $_,
            error   => (/error/i) ? 1 : 0
        };
        last if (@log > $some_large_number );
    }
    close(LOG);
}
$tmpl->param( log1 => \@log );
[download]

The other problem, though, is that it looks like you want to dump the entire log into a web page. With an especially large log file, that will be a problem for the client's memory and take a long time for the data transfer. You'll want to add an "if the log is bigger than n lines, stop" line inside the while.