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  1. or download this
    s/\|\|/|\\N|/;
  2. or download this
    s/\|(?=\|)/|\\N/g;
s/^\|/\\N|/;
s/\|$/|\\N/;
  3. or download this
    perl -pe"s/\|(?=\|)/|\\N/g; s/^\|/\\N|/; s/\|$/|\\N/" infile >outfile