If you are interested in fast TSV tooling you might also try xsv [1], which is written in Rust and has similar features to the linked tsv-utils-dlang project.

If you are interested in fast TSV tooling you might also try xsv [1], which is written in Rust and has similar features to the linked tsv-utils-dlang project. The frequency command computes the frequency of values in 2 columns in < 2 seconds on my machine. Its a different task, but there are some similarities. xsv frequency -n -s 1,2 -l 100 googlebooks-eng-all-1gram-20120701-0.tsv 5.19s user 0.06s system 351% cpu 1.490 total [1] https://github.com/BurntSushi/xsv https://github.com/BurntSushi/xsv