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  1. or download this
    $ perl -e  '@c=readdir DIR ; print "@c\n";'
  2. or download this
    $ perl -w -e  '@c=readdir DIR ; print "@c\n";'
Name "main::DIR" used only once: possible typo at -e line 1.
readdir() attempted on invalid dirhandle DIR at -e line 1.
  3. or download this
    $ perl -e  '@c=readdir DIR or print "$!"; print "@c\n";'
Bad file descriptor