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copied!<ol> <li>You have a project -- call it <strong>MyWebApp</strong> that already has a github repo</li> <li>You want to use the <strong>jquery repository</strong> in your project</li> <li>You want to pull the jquery repo into your project as a <strong>submodule</strong>.</li> </ol> <p>Submodules are really, really easy to reference and use. Assuming you already have MyWebApp set up as a repo, from terminal issue these commands:</p> <pre><code>cd MyWebApp git submodule add git://github.com/jquery/jquery.git externals/jquery </code></pre> <p>This will create a directory named <code>externals/jquery</code>* and link it to the github jquery repository. Now we just need to init the submodule and clone the code to it: </p> <pre><code>git submodule update --init --recursive </code></pre> <p>You should now have all the latest code cloned into the submodule. If the jquery repo changes and you want to pull the latest code down, just issue the <code>submodule update</code> command again. Please note: I typically have a number of external repositories in my projects, so I always group the repos under an "externals" directory.</p> <p>The online <a href="http://www.git-scm.com/book/en/Git-Tools-Submodules">Pro Git Book</a> has some good information on submodules (and git in general) presented in an easy-to-read fashion. Alternately, <code>git help submodule</code> will also give good information. Or take a look at the <a href="https://git.wiki.kernel.org/index.php/GitSubmoduleTutorial">Git Submodule Tutorial</a> on the git wiki.</p> <p>I noticed this blog entry which talks about submodules and compares them to Subversion's svn:externals mechanism: <a href="http://speirs.org/blog/2009/5/11/understanding-git-submodules.html">http://speirs.org/blog/2009/5/11/understanding-git-submodules.html</a> </p> <p><sub>* As a best practice, you should always place your submodules in their own directory, such as Externals. If you don't, your root project directory can become very cluttered very fast.</sub></p>

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