Its rush, a typo. I do not recommend it for serious usage, its more or less failed PoC. On the other hand, its basically the same as ergonomica, and I would prefer ruby to python when shell is in question, given that white space thingie.
It looks like there was a recent activity maintainer tho, see a PR, but its abandoned again: https://github.com/adamwiggins/rush/pull/19
