core.clj

(ns foo.core)

(defn -main [& args]
  (println "Passed in 'args' are:" args))

gistfile1.txt

> lein foo bar baz
Passed in 'args' are: (bar baz)

> lein run -m foo.core bar baz
Passed in 'args' are: (bar baz)

> lein foo --help
foo is an alias, expands to ["run" "-m" "foo.core"]

> lein run -m foo.core --help
Passed in 'args' are: (--help)

> lein foo -- --help
Passed in 'args' are: (-- --help)

project.clj

(defproject foo "0.1.0-SNAPSHOT"
  :description "FIXME: write description"
  :url "http://example.com/FIXME"
  :license {:name "Eclipse Public License"
            :url "http://www.eclipse.org/legal/epl-v10.html"}
  :dependencies [[org.clojure/clojure "1.6.0"]]
  :aliases {"foo" ["run" "-m" "foo.core"]})