#readdir DIRHANDLE

Returns the next directory entry for a directory opened by opendir. If used in list context, returns all the rest of the entries in the directory. If there are no more entries, returns the undefined value in scalar context and the empty list in list context.

If you're planning to filetest the return values out of a readdir, you'd better prepend the directory in question. Otherwise, because we didn't chdir there, it would have been testing the wrong file.

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

As of Perl 5.12 you can use a bare readdir in a while loop, which will set $_ on every iteration. If either a readdir expression or an explicit assignment of a readdir expression to a scalar is used as a while/for condition, then the condition actually tests for definedness of the expression's value, not for its regular truth value.

opendir(my $dh, $some_dir) || die "Can't open $some_dir: $!";
while (readdir $dh) {
    print "$some_dir/$_\n";
}
closedir $dh;

To avoid confusing would-be users of your code who are running earlier versions of Perl with mysterious failures, put this sort of thing at the top of your file to signal that your code will work only on Perls of a recent vintage:

use v5.12; # so readdir assigns to $_ in a lone while test

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