Guile is an implementation of the Scheme programming language. Scheme (http://schemers.org/) is an elegant and conceptually simple dialect of Lisp, originated by Guy Steele and Gerald Sussman, and since evolved by the series of reports known as RnRS (the Revised^n Reports on Scheme).
(+ 1 2 3) ; add some numbers $1 = 6 (define (factorial n) ; define a function (if (zero? n) 1 (* n (factorial (- n 1))))) (factorial 20) (getpwnam \"root\") ; look in /etc/passwd
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!# (display \"Hello, world!\") (newline)