Perl5 リファレンス

       unlink LIST

       unlink  Deletes a list of files.  Returns the number of
               files successfully deleted.

                   $cnt = unlink 'a', 'b', 'c';
                   unlink @goners;
                   unlink <*.bak>;

               Note: `unlink' will not delete directories unless
               you are superuser and the -U flag is supplied to
               Perl.  Even if these conditions are met, be warned
               that unlinking a directory can inflict damage on
               your filesystem.  Use `rmdir' instead.

               If LIST is omitted, uses `$_'.