Hi Folks, I am working on a script to check whether application started by matching a string in its log file. I intend to populate an array with last lines (20lines) of the log file instead of the entire file then match a string which stands for starting successfully. But if application restarts multiple time within a short period, I cannot know if it is the match string from last start up. My code is still searching in entire file. If anyone knows how to correct my code, please do. Thanks

 use File::ReadBackwards;
use strict;
use autodie;
use File::stat;
my $file = 'D:/service_console.log';
my $bw = File::ReadBackwards->new($file);
while (defined ( my $log_line = $bw->readline))
{  for( my $n=0; $<=3; $n++)
   {
    my $size = stat($file)->size;
    sleep(60);
    my $size = stat($file)->size;
    last if ( $size1 == $size2);
    }
    push (my @array, $log_line);
   for (@array)
   { last if (/ running mode/);}
}$bw->close();
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