Undocumented in source.

auto helpText = q"EOS Synopsis: tsv-uniq [options] [file...] tsv-uniq filters out duplicate lines using fields as a key. Filtering is based on the entire line when key fields are not provided. Options are also available for assigning a unique id to each key and numbering the occurrences of each key. Fields are specified using field number or field name. Field names can be used when the input file has a header line. Use '--help-verbose' for more details. Options: EOS";