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  1. or download this
    open my $OUT, '>>', "$mycrdir/file_detail.txt" or die "Can't create '$
+mycrdir/file_detail.txt'" ;
  2. or download this
    my $filename = "$mycrdir/file_detail.txt";
open my $OUT, '>>', $filename
  or die "Can't create '$filename'";
  3. or download this
    open my $OUT, '>>', $filename
  or die "Can't create '$filename': $!";