Looking at your code below, all you want to do is to find out how many *.infotmp* files there are under $memberinfo directory.
opendir (DIR, "$memberinfo");
@file = grep { /.infotmp/ } readdir(DIR);
close (DIR);
$new_files = push(@file);
You could replace all that with a one-liner:
$new_files = @{[<$memberinfo/*\.infotmp*>]};
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