Try Fastmash on your data and tell us what happens

[pederbe]

Fastmash is most useful when it makes a command you already run faster or simpler. If you try it on your own data, please share:

• The command you ran.
• Roughly how many records and fields the input contains.
• Your Fastmash version, operating system and processor.
• What worked, what was awkward and any timing you measured.

For example, a grouped summary is:

fastmash -s -g 1 count 2 median 3 < data.tsv

The quick start has more examples, including quoted CSV. The benchmark kit can compare your command against GNU datamash and checks output before reporting timings.

If Fastmash prints an unexpected result, refuses a command you need or runs slower, please open an issue. A small example that reproduces the problem helps. Please do not upload private data.

Fastmash 0.2.0 runs on Linux x86-64, Windows through WSL2 and Apple Silicon macOS 15+. Installation.