rare

It scans text streams and files, extracts data with regular expressions or tokenizers, and produces real‑time summaries in a variety of formats such as filters, histograms, tables, bar graphs, heatmaps, sparklines, and numeric analyses. The tool supports glob patterns, recursive directory traversal, optional gzip decompression, and can follow growing files with tail‑like behavior. Users can manipulate results with handlebars‑style expressions, ignore lines matching a pattern, and pipe input or output for integration with other commands.

The program is multi‑threaded, offering fast processing of large logs, CSV, JSON, and similar text sources. Output can be color‑coded or formatted as CSV, and several aggregators allow grouping, sorting, and reducing data with custom expressions. It runs on the command line and is available as a prebuilt binary, Homebrew package, or via a simple install script, with optional PCRE2 support for faster regex handling on Linux.