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    opendir(DIR, $some_dir) || die "can't opendir $some_dir: $!";
    @dots = grep { /^\./ && -f "$some_dir/$_" } readdir(DIR);
    closedir DIR;

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    opendir(DIR, $some_dir) || die "can't opendir $some_dir: $!";
    @files = grep {/\.txt$/} readdir(DIR);
    closedir DIR;
    unlink @files;