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2.1 Running Guile Interactively
In its simplest form, Guile acts as an interactive interpreter for the
Scheme programming language, reading and evaluating Scheme expressions
the user enters from the terminal. Here is a sample interaction between
Guile and a user; the user’s input appears after the $ and
scheme@(guile-user)> prompts:
$ guile
scheme@(guile-user)> (+ 1 2 3) ; add some numbers
$1 = 6
scheme@(guile-user)> (define (factorial n) ; define a function
(if (zero? n) 1 (* n (factorial (- n 1)))))
scheme@(guile-user)> (factorial 20)
$2 = 2432902008176640000
scheme@(guile-user)> (getpwnam "root") ; look in /etc/passwd
$3 = #("root" "x" 0 0 "root" "/root" "/bin/bash")
scheme@(guile-user)> C-d
$
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