Never use defined() on arrays nor on hashes because it doesn't mean what you think it means. You want one of these:

    if(  @ARGV  &&  $ARGV[0] eq "-all"  ) {
    if(  0 < @ARGV  &&  "-all" eq $ARGV[0]  ) {
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An empty array can still be "defined" (or un"defined"), depending on obscure details about its history. Also, $ARGV[0] =~ /-all/ will be true if your first argument is "tell-all books", for example, probably not what you wanted.

        - tye (but my friends call me "Tye")