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user=> *ns*
#<Namespace user>
user=> (in-ns 'greetings)
#<Namespace greetings>
greetings=> clojure.core/*ns*
#<Namespace greetings>
greetings=> (clojure.core/println "Hello, World!")
Hello, World!
nil

greetings=> map
java.lang.Exception: Unable to resolve symbol: map in this context (NO_SOURCE_FILE:0)
greetings=> (clojure.core/refer 'clojure.core :only '(map set))
nil
greetings=> map
#<core$map clojure.core$map@41a68961>

greetings=> (alias 'core 'clojure.core)
nil
greetings=> (core/println "s")
s
nil

(defn f [x] (println x))

greetings=> (load-file "./lib.clj")
#'greetings/f
greetings=> (f "x")
x
nil

greetings=> (require 'example.lib)
nil
greetings=> (g)
inside
nil
greetings=> (require '(example/lib))
nil

greetings=> (require '[example.lib :as lib])
java.lang.Exception: namespace 'example.lib' not found (NO_SOURCE_FILE:0)

greetings=> (import 'java.util.Date)
java.util.Date
greetings=> (new Date)
#<Date Sun Nov 04 17:32:40 CST 2012>