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  1. or download this
    open FILE, "<hostname_check.txt" || die $!;
  2. or download this
    open ( FILE, "<hostname_check.txt" ) || die $!;
  3. or download this
    open FILE, "<hostname_check.txt" or die $!;
  4. or download this
    open my $fh, '<',"hostname_check.txt" or die $!;