open my $fhi, '<', 'C:\shekhar_Axestrack_Intern\WindowCreation\ListOfIpAdress.txt', or die "Could not open file $!";
    while (my $line = <$fhi>) 
    {   
       ## Doing some operation using $fhi in read mode
        if($Time >'33')
        { 
          $fhi->autoflush; #flush the line if time is greater than 33 hours, whereas all other lines which do not folow the condition are still present in file.
        }
    }
    close $fhi;