Leiningen 安装
Leiningen是一个Clojure项目管理工具。
安装过程如下：
1. 下载lein脚本
https://raw.github.com/technomancy/leiningen/preview/bin/lein
2. 复制到/usr/bin目录下，并允许执行
mv lein /usr/bin/ root@chenshu-yangzhou-home:~/Downloads# chmod +x /usr/bin/lein
3. 运行lein命令，不要使用root权限
lein Downloading Leiningen now... --2012-12-25 17:20:49-- https://github.com/downloads/technomancy/leiningen/leiningen-2.0.0-preview10-standalone.jar Resolving github.com (github.com)... 207.97.227.239 Connecting to github.com (github.com)|207.97.227.239|:443... connected. HTTP request sent, awaiting response... 302 Found Location: http://cloud.github.com/downloads/technomancy/leiningen/leiningen-2.0.0-preview10-standalone.jar [following] --2012-12-25 17:20:50-- http://cloud.github.com/downloads/technomancy/leiningen/leiningen-2.0.0-preview10-standalone.jar Resolving cloud.github.com (cloud.github.com)... 216.137.55.10, 216.137.55.192, 216.137.55.57, ... Connecting to cloud.github.com (cloud.github.com)|216.137.55.10|:80... connected. HTTP request sent, awaiting response... 200 OK Length: 11129174 (11M) [application/x-java-archive] Saving to: `/home/chenshu/.lein/self-installs/leiningen-2.0.0-preview10-standalone.jar.pending' 100%[======================================>] 11,129,174 459K/s in 23s 2012-12-25 17:21:14 (470 KB/s) - `/home/chenshu/.lein/self-installs/leiningen-2.0.0-preview10-standalone.jar.pending' saved [11129174/11129174] Leiningen is a tool for working with Clojure projects. Several tasks are available: check Check syntax and warn on reflection. classpath Write the classpath of the current project to output-file. clean Remove all files from project's target-path. compile Compile Clojure source into .class files. deploy Build jar and deploy to remote repository. deps Show details about dependencies. do Higher-order task to perform other tasks in succession. help Display a list of tasks or help for a given task. install Install current project to the local repository. jar Package up all the project's files into a jar file. javac Compile Java source files. new Generate project scaffolding based on a template. plugin DEPRECATED. Please use the :user profile instead. pom Write a pom.xml file to disk for Maven interoperability. repl Start a repl session either with the current project or standalone. retest Run only the test namespaces which failed last time around. run Run the project's -main function. search Search remote maven repositories for matching jars. show-profiles List all available profiles or display one if given an argument. test Run the project's tests. trampoline Run a task without nesting the project's JVM inside Leiningen's. uberjar Package up the project files and all dependencies into a jar file. upgrade Upgrade Leiningen to specified version or latest stable. version Print version for Leiningen and the current JVM. with-profile Apply the given task with the profile(s) specified. Run lein help $TASK for details. See also: readme, faq, tutorial, news, sample, profiles, deploying and copying.
注意国内可能需要使用proxy才能下载，参考我的关于终端如何设置http代理的方式。
http://blog.csdn.net/sheismylife/article/details/8331287
如果因为网络原因安装失败，删除掉~/.lein目录后重新执行lein命令即可。
现在可以启动一个REPL会话，上一片里面用的是java -cp 命令，这里更简单：
$ lein repl
nREPL server started on port 55538
REPL-y 0.1.0-beta10
Clojure 1.4.0
Exit: Control+D or (exit) or (quit)
Commands: (user/help)
Docs: (doc function-name-here)
(find-doc "part-of-name-here")
Source: (source function-name-here)
(user/sourcery function-name-here)
Javadoc: (javadoc java-object-or-class-here)
Examples from clojuredocs.org: [clojuredocs or cdoc]
(user/clojuredocs name-here)
(user/clojuredocs "ns-here" "name-here")
user=>输入一个lisp表达式看看：
user=> (+ 1 2) 3能够运行。注意=>左边的user代表当前的namespace.