This project is dormant. I have not worked on it in years, and am unlikely to continue work on it anytime soon. I encourage you to check out "mal" -- "Make a Lisp" -- by Joel Martin, a project inspired by this one, that includes implementations in dozens of languages, including Bash: https://github.com/kanaka/mal. While it's missing garbage collection, mal's Bash Lisp is incredibly clean and easy to hack on. gherkin is a dialect of Lisp, and like other Lisps such as Clojure and [Scheme](http://en.wikipedia.org/wiki/Scheme_(programming_language) it features homoiconicity, first-class functions, and primitive functions for operating on a variety of data types such as strings, integers, symbols, and lists. As a citizen of *nix and the shell environment, it also provides *nix and shell interoperation facilities.