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<!DOCTYPE html><html lang="en-US"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width,height=device-height,initial-scale=1.0"><meta name="apple-mobile-web-app-capable" content="yes"><meta http-equiv="X-UA-Compatible" content="ie=edge"><meta property="og:type" content="website"><meta name="twitter:card" content="summary"><style>.bespoke-marp-note,.bespoke-marp-osc,.bespoke-progress-parent{display:none;transition:none}@media screen{body[data-bespoke-view=""] .bespoke-marp-parent>.bespoke-marp-osc>button,body[data-bespoke-view=next] .bespoke-marp-parent>.bespoke-marp-osc>button,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container button{-webkit-appearance:none;-moz-appearance:none;appearance:none;background-color:transparent;border:0;color:inherit;cursor:pointer;font-size:inherit;opacity:.8;outline:none;padding:0;transition:opacity .2s linear;-webkit-tap-highlight-color:transparent}body[data-bespoke-view=""] 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- var(--marpit-advanced-background-split, 50%))}div#p>svg>foreignObject>section[data-marpit-advanced-background=background]>div[data-marpit-advanced-background-container]>figure{all:initial;background-position:center;background-repeat:no-repeat;background-size:cover;flex:auto;margin:0}div#p>svg>foreignObject>section[data-marpit-advanced-background=content],div#p>svg>foreignObject>section[data-marpit-advanced-background=pseudo]{background:transparent!important}div#p>svg>foreignObject>section[data-marpit-advanced-background=pseudo],div#p>svg[data-marpit-svg]>foreignObject[data-marpit-advanced-background=pseudo]{pointer-events:none!important}div#p>svg>foreignObject>section[data-marpit-advanced-background-split]{width:100%;height:100%}</style></head><body><div class="bespoke-marp-osc"><button data-bespoke-marp-osc="prev" tabindex="-1" title="Previous slide">Previous slide</button><span data-bespoke-marp-osc="page"></span><button data-bespoke-marp-osc="next" tabindex="-1" title="Next slide">Next slide</button><button data-bespoke-marp-osc="fullscreen" tabindex="-1" title="Toggle fullscreen (f)">Toggle fullscreen</button><button data-bespoke-marp-osc="presenter" tabindex="-1" title="Open presenter view (p)">Open presenter view</button></div><div id="p"><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="1">
<h1>A Tutorial of Git and Source Code Management</h1>
<p><img src="images/version-control.jpg" alt="version control" /></p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="2">
<h1>Why version control?</h1>
<p>Have you ever met one of these problems?</p>
<ul>
<li>
<p>The code I did last night worked. I wish I could revert it back.</p>
</li>
<li>
<p>I have to copy the same file to maintain multiple versions, and now I don't know their differences and don't know which one to choose.</p>
</li>
<li>
<p>I want someone else to participate in my work, but I don't want him to overwrite my progress.</p>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="3">
<h1>Git and its history</h1>
<p>Git is a distributed version-control system, created by Linus Torvalds (who is also the creator of Linux kernel) in 2005, originally designed for efficiently handling large projects like Linux kernel.</p>
<p>People may get confused with git and github. Git is a command-line tool for version control. While github is a website that user can share and even collaborate on their git repositories.</p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="4">
<h1>Level of difficulty</h1>
<p>I will categorize each page with a level of difficulty.</p>
<p><img src="https://img.shields.io/badge/-Basic-brightgreen" alt="basic" /> Basic commands that you should be familiar with</p>
<p><img src="https://img.shields.io/badge/-Intermediate-blue" alt="intermediate" /> Learning these commands or knowledge will help you understand how git internally works</p>
<p><img src="https://img.shields.io/badge/-Advanced-red" alt="advanced" /> Advanced skills but still proved to be useful</p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="5">
<h1>Getting a repository <img src="https://img.shields.io/badge/-Basic-brightgreen" alt="basic" /></h1>
<p>A Repository is a location that you keep all the files related to your project.</p>
<p>We can either create a new repository (<code>git init</code>), or get an existing repository from somewhere else (<code>git clone</code>).</p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="6">
<h1>Getting a repository <img src="https://img.shields.io/badge/-Basic-brightgreen" alt="basic" /></h1>
<h2>git clone</h2>
<p>This will copy a remote repository (usually from the Internet) to your local filesystem.</p>
<pre><code class="language-git"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>git clone https://github.com/PropicSignifi/GitTutorial
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="7">
<h1>Getting a repository <img src="https://img.shields.io/badge/-Basic-brightgreen" alt="basic" /></h1>
<h2>git init</h2>
<p>This will convert your current directory into a git repository</p>
<pre><code class="language-git"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>mkdir MyProject
cd MyProject
git init
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="8">
<h1>Checking your status <img src="https://img.shields.io/badge/-Basic-brightgreen" alt="basic" /></h1>
<h2>git status</h2>
<p>It shows the status of your current branch, the status of all the files in<br />
your repository, and the status of the differences between your local branch<br />
and your remote branch.</p>
<p>This is an example of a clean status. We will see more complicated status as<br />
the tutorial proceeds.</p>
<pre><code class="language-git"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>$ git status
On branch master
Your branch is up to date with 'origin/master'.
nothing to commit, working tree clean
</span></span></foreignObject></svg></code></pre>
<p>Advice: always check your status before taking further actions.</p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="9">
<h1>Branch <img src="https://img.shields.io/badge/-Basic-brightgreen" alt="basic" /></h1>
<h2>git branch</h2>
<p><code>git branch</code> shows the status of the branches.</p>
<pre><code class="language-git"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>$ git branch
* master
</span></span></foreignObject></svg></code></pre>
<p>This shows me that I have only one branch named "master". By default, "master"<br />
is the main branch of a git repository.</p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="10">
<h1>Branch <img src="https://img.shields.io/badge/-Basic-brightgreen" alt="basic" /></h1>
<h2>git branch</h2>
<p>We can create a new branch by type a new branch name after <code>git branch</code>:</p>
<pre><code class="language-git"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>$ git branch myNewBranch
</span></span></foreignObject></svg></code></pre>
<p>Now check your branches status again.</p>
<pre><code class="language-git"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>$ git branch
* master
myNewBranch
</span></span></foreignObject></svg></code></pre>
<p>We have two branches now, but our current working branch is still "master".</p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="11">
<h1>Branch <img src="https://img.shields.io/badge/-Basic-brightgreen" alt="basic" /></h1>
<h2>git checkout <branch></h2>
<p>We can switch to a different branch using the command <code>git checkout</code></p>
<pre><code class="language-git"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>$ git checkout myNewBranch
$ git branch
master
* myNewBranch
</span></span></foreignObject></svg></code></pre>
<p><img src="https://img.shields.io/badge/-Intermediate-blue" alt="intermediate" /><br />
<code>git checkout</code> has many, many usages. We can use it to switch to a branch,<br />
a commit, or a tag. We can also checkout a file or a directory. Even<br />
more, we can combine the both. For example, checkout a file from a<br />
specific branch. We will see some of these examples later.</p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="12">
<h1>Making changes <img src="https://img.shields.io/badge/-Basic-brightgreen" alt="basic" /></h1>
<p>Let's start from creating a new file, name it "hello.txt", and add some<br />
content to the file:</p>
<pre><code class="language-git"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>echo "Hello world" >> hello.txt
</span></span></foreignObject></svg></code></pre>
<p>Now if we see our <code>git status</code>, we can see "hello.txt" is recognized as<br />
an untracked file.</p>
<pre><code class="language-git"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>$ git status
On branch myNewBranch
Untracked files:
(use "git add <file>..." to include in what will be committed)
hello.txt
nothing added to commit but untracked files present (use "git add" to track)
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="13">
<h1>Making changes <img src="https://img.shields.io/badge/-Basic-brightgreen" alt="basic" /></h1>
<h2>git add <path></h2>
<p><code>git add</code> will convert our untracked file to a staged status.</p>
<pre><code class="language-git"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>$ git add hello.txt
$ git status
On branch myNewBranch
Changes to be committed:
(use "git restore --staged <file>..." to unstage)
new file: hello.txt
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="14">
<h1>Making changes <img src="https://img.shields.io/badge/-Basic-brightgreen" alt="basic" /></h1>
<h2>git commit</h2>
<p>We are not ready to commit our change. A new commit requires a commit message.<br />
You may pass your commit message through the <code>-m</code> option.</p>
<pre><code class="language-git"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>git commit -m "Add the line Hello world to the file hello.txt"
</span></span></foreignObject></svg></code></pre>
<p>Now check our status again. Everything is clean.</p>
<pre><code class="language-git"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>$ git status
On branch myNewBranch
nothing to commit, working tree clean
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="15">
<h1>Checking the history <img src="https://img.shields.io/badge/-Basic-brightgreen" alt="basic" /></h1>
<h2>git log</h2>
<pre><code class="language-git"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>$ git log
commit 4ce2556bc32186220054359bc275f8a6a90d4ca4 (HEAD -> myNewBranch)
Author: Henry Li <[email protected]>
Date: Fri Mar 6 11:20:14 2020 +1100
Add the line Hello world to the file hello.txt
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="16">
<h1>Checking the history <img src="https://img.shields.io/badge/-Basic-brightgreen" alt="basic" /></h1>
<h2>git log</h2>
<p>Many times, we can use <code>git log -p</code> instead, which will also show the<br />
detailed changes.</p>
<pre><code class="language-git"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>$ git log -p
commit 4ce2556bc32186220054359bc275f8a6a90d4ca4 (HEAD -> myNewBranch)
Author: Henry Li <[email protected]>
Date: Fri Mar 6 11:20:14 2020 +1100
Add the line Hello world to the file hello.txt
diff --git a/hello.txt b/hello.txt
new file mode 100644
index 0000000..802992c
--- /dev/null
+++ b/hello.txt
@@ -0,0 +1 @@
+Hello world
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="17">
<h1>Checking the changes <img src="https://img.shields.io/badge/-Basic-brightgreen" alt="basic" /></h1>
<h2>git diff</h2>
<p>Using <code>git diff</code> can also check the changes. For example, <code>git diff master</code><br />
will show us the difference from the master branch to our current branch.</p>
<pre><code class="language-diff"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>$ git diff master
diff --git a/hello.txt b/hello.txt
new file mode 100644
index 0000000..802992c
<span class="hljs-comment">--- /dev/null</span>
<span class="hljs-comment">+++ b/hello.txt</span>
@@ -0,0 +1 @@
<span class="hljs-addition">+Hello world</span>
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="18">
<h1>Making changes <img src="https://img.shields.io/badge/-Basic-brightgreen" alt="basic" /></h1>
<p>Let's continue to make changes on the file "hello.txt".</p>
<pre><code class="language-git"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>echo "Hello again" >> hello.txt
</span></span></foreignObject></svg></code></pre>
<p>Check the status. This time, the file "hello.txt" is in a modified status.</p>
<pre><code class="language-git"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>$ git st
On branch master
Changes not staged for commit:
(use "git add <file>..." to update what will be committed)
(use "git restore <file>..." to discard changes in working directory)
modified: hello.txt
no changes added to commit (use "git add" and/or "git commit -a")
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="19">
<h1>Checking the changes <img src="https://img.shields.io/badge/-Basic-brightgreen" alt="basic" /></h1>
<p>If there are files in a modified status, we can see the unstaged<br />
changes using <code>git diff</code>.</p>
<pre><code class="language-diff"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>$ git diff
diff --git a/hello.txt b/hello.txt
index 802992c..06ae335 100644
<span class="hljs-comment">--- a/hello.txt</span>
<span class="hljs-comment">+++ b/hello.txt</span>
@@ -1 +1,2 @@
Hello world
<span class="hljs-addition">+Hello again</span>
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="20">
<h1>File status <img src="https://img.shields.io/badge/-Basic-brightgreen" alt="basic" /></h1>
<p>So far, we've seen all four different status of a file. They are:</p>
<ul>
<li>Staged</li>
<li>Modified (unstaged)</li>
<li>Untracked (new)</li>
<li>Unmodified (clean)</li>
</ul>
<p><img src="images/status.png" alt="status" /></p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="21">
<h1>File status <img src="https://img.shields.io/badge/-Basic-brightgreen" alt="basic" /></h1>
<p><img src="images/lifecycle.png" alt="status-cycle" /></p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="22">
<h1>Discarding the changes <img src="https://img.shields.io/badge/-Intermediate-blue" alt="basic" /></h1>
<p>For different file status, commands for discarding the changes would be<br />
different.</p>
<h2>git checkout <path></h2>
<p>The most common situation is to discard modified/unstaged changes: we<br />
need to use <code>git checkout <path></code>.</p>
<pre><code class="language-git"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>git checkout hello.txt
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="23">
<h1>Discarding the changes <img src="https://img.shields.io/badge/-Intermediate-blue" alt="basic" /></h1>
<h2>git reset <path></h2>
<p>For files in staged status, we can use <code>git reset <path></code> to convert it<br />
to unstaged status, then use <code>git checkout <path></code> to discard the changes.</p>
<pre><code class="language-git"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>git reset hello.txt
git checkout hello.txt
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="24">
<h1>Discarding the changes <img src="https://img.shields.io/badge/-Intermediate-blue" alt="basic" /></h1>
<h2>git clean -f <file></h2>
<p>For those untracked files, we may simply use <code>rm <file></code> to get rid of it,<br />
since git doesn't care about the file.</p>
<p>Alternatively, we can use <code>git clean -f <file></code>.</p>
<pre><code class="language-git"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>touch randomNewFile
git clean -f randomNewFile
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="25">
<h1>Pulling the changes <img src="https://img.shields.io/badge/-Basic-brightgreen" alt="basic" /></h1>
<h2>git pull</h2>
<p>Git is a distributed version control system, which means there are also changes<br />
made by other people from other places. We can get their update using the<br />
<code>git pull</code> command.</p>
<p>Usually we only care about the main branch (master) from our remote server.<br />
So the following one would be a frequently used command:</p>
<pre><code class="language-git"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>git pull origin master
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="26">
<h1>Pushing the changes <img src="https://img.shields.io/badge/-Basic-brightgreen" alt="basic" /></h1>
<h2>git push</h2>
<p>When you think your changes are good enough, you'd probably want to push your<br />
changes to the remote server. Usually, you wouldn't want to push the changes to<br />
the main branch (master) directly, so we should do the push for our current<br />
branch.</p>
<pre><code class="language-git"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>git push origin myNewBranch
</span></span></foreignObject></svg></code></pre>
<p>When the push is finished, your local branch "myNewBranch" will be copied to<br />
the remote repository.</p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="27">
<h1>To be continued...</h1>
<p>More topics:</p>
<ul>
<li>
<p>git stash</p>
</li>
<li>
<p>git merge</p>
</li>
<li>
<p>git rebase</p>
</li>
<li>
<p>git revert</p>
</li>
<li>
<p>git cherry-pick</p>
</li>
<li>
<p>git diff / git apply</p>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="28">
<h1>References</h1>
<p><a href="https://git-scm.com/book/en/v2">Pro Git, Scott Chacon and Ben Straub</a></p>
</section>
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