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  1. or download this
    open FILE, "+< test.cfg" || die "Cannot open file\n" ;
  2. or download this
    open FILE, ("+< test.cfg" || die "Cannot open file\n") ;
  3. or download this
    open FILE, "+< test.cfg" or die "Cannot open file\n";
  4. or download this
    open my $fh, '+<', 'test.cfg" or die "Cannot open file: $!\n";