my $flashcount_file = "/var/www/html/log/flashcount.txt";

open my $flashcount, "<", $flashcount_file;
my $count = <$flashcount>;
$count =~ s/^count=//;    # <-- remove "count="
$count++;
close $flashcount;

open my $flashcount, ">", $flashcount_file;
print $flashcount "count=$count";
close $flashcount;