Spark: Sparklines in your shell
git.zx2c4.com
git.zx2c4.com
Anyway, a better known implementation (in Bash) is probably https://github.com/holman/spark, which was developed by Zach Holman, one of the first GitHub hires.
I think Teletext might be even worse. IIRC, it only has three heights for its triangles.
If you’re interested in multiline plotting with braille characters, Ian Henry’s bytemap for Janet (https://github.com/ianthehenry/bytemap) is worth a look (or my Clojure port: https://github.com/waddie/bytemap.clj).
As for Braille, the last Unicode standard added Kaypro’s 2x4 mosaics, so we can stop misusing Braille for that (a huge relief to me, because the banding that often happens always annoys me).
Anyway, this field has more famous people than anyone can keep track of; I hadn't heard of Zach Holman until just now either. For what it's worth, zx2c4 is also fairly well known for WireGuard.
Jokes aside this is always a good thing, the ability to roughly visualize graphs real quick can be really useful for sysadmins, data-massagers and other nerds. If you don't use this or the alternatives suggested in the comments code your own! Make your logs, analysis tools and other visualizations prettier! Add colors or other bells and whistles at your convenience!
I really like the very concept of sparklines, if you can't tell.