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<!DOCTYPE html>
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<title>Lab 13 - Git Immersion - Brought to you by EdgeCase</title>
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<a href="index.html" id="home_link">Git Immersion</a>
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<h1 class="lab_title"><em>lab 13</em> Tagging versions</h1>
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<h1 class="lab_title"><em>lab 13</em> Tagging versions</h1>
<h3>Goals</h3>
<ul>
<li>Learn how to tag commits with names for future reference</li>
</ul>
<p>Let’s call the current version of the hello program version 1 (v1).</p>
<h2>Tagging version 1 <em>01</em></h2>
<h4>Execute:</h4>
<pre class="instructions">git tag v1</pre>
<p>Now you can refer to the current version of the program as v1.</p>
<h2>Tagging Previous Versions <em>02</em></h2>
<p>Let’s tag the version immediately prior to the current version v1-beta. First we need to checkout the previous version. Rather than lookup up the hash, we will use the <code>^</code> notation to indicate “the parent of v1”.</p>
<p class="note">If the <code>v1</code>^ notation gives you any trouble, you can also try <code>v1~1</code>, which will reference the same version. This notation means “the first ancestor of v1”.</p>
<h4>Execute:</h4>
<pre class="instructions">git checkout v1^
cat hello.rb</pre>
<h4>Output:</h4>
<pre class="sample">$ git checkout v1^
Note: checking out 'v1^'.
You are in 'detached HEAD' state. You can look around, make experimental
changes and commit them, and you can discard any commits you make in this
state without impacting any branches by performing another checkout.
If you want to create a new branch to retain commits you create, you may
do so (now or later) by using -b with the checkout command again. Example:
git checkout -b new_branch_name
HEAD is now at 1b754e9... Added a default value
$ cat hello.rb
name = ARGV.first || "World"
puts "Hello, #{name}!"
</pre>
<p>See, this is the version with the default value <em>before</em> we added the comment. Let’s make this v1-beta.</p>
<h4>Execute:</h4>
<pre class="instructions">git tag v1-beta</pre>
<h2>Checking Out by Tag Name <em>03</em></h2>
<p>Now try going back and forth between the two tagged versions.</p>
<h4>Execute:</h4>
<pre class="instructions">git checkout v1
git checkout v1-beta</pre>
<h4>Output:</h4>
<pre class="sample">$ git checkout v1
Previous HEAD position was 1b754e9... Added a default value
HEAD is now at 4054321... Added a comment
$ git checkout v1-beta
Previous HEAD position was 4054321... Added a comment
HEAD is now at 1b754e9... Added a default value
</pre>
<h2>Viewing Tags using the <code>tag</code> command <em>04</em></h2>
<p>You can see what tags are available using the <code>git tag</code> command.</p>
<h4>Execute:</h4>
<pre class="instructions">git tag</pre>
<h4>Output:</h4>
<pre class="sample">$ git tag
v1
v1-beta
</pre>
<h2>Viewing Tags in the Logs <em>05</em></h2>
<p>You can also check for tags in the log.</p>
<h4>Execute:</h4>
<pre class="instructions">git hist master --all</pre>
<h4>Output:</h4>
<pre class="sample">$ git hist master --all
* 4054321 2012-03-06 | Added a comment (v1, master) [Jim Weirich]
* 1b754e9 2012-03-06 | Added a default value (HEAD, v1-beta) [Jim Weirich]
* 3053491 2012-03-06 | Using ARGV [Jim Weirich]
* 3cbf83b 2012-03-06 | First Commit [Jim Weirich]</pre>
<p>You can see both tags (<code>v1</code> and <code>v1-beta</code>) listed in the log output, along with the branch name (<code>master</code>). Also <code>HEAD</code> shows you the currently checked out commit (which is <code>v1-beta</code> at the moment).</p>
</div>
<div id="index">
<h1>Table of Contents</h1>
<div id="show_bookmarks"></div>
<div id="no_bookmarks"></div>
<ul>
<li id="lab_0_link"><a href="index.html"><span> </span>Home Cover Page</a></li>
<li id="lab_1_link" data-lab-id="1"><a href="lab_01.html"><span>1:</span> Setup</a></li>
<li id="lab_2_link" data-lab-id="2"><a href="lab_02.html"><span>2:</span> More Setup</a></li>
<li id="lab_3_link" data-lab-id="3"><a href="lab_03.html"><span>3:</span> Create a Project</a></li>
<li id="lab_4_link" data-lab-id="4"><a href="lab_04.html"><span>4:</span> Checking Status</a></li>
<li id="lab_5_link" data-lab-id="5"><a href="lab_05.html"><span>5:</span> Making Changes</a></li>
<li id="lab_6_link" data-lab-id="6"><a href="lab_06.html"><span>6:</span> Staging Changes</a></li>
<li id="lab_7_link" data-lab-id="7"><a href="lab_07.html"><span>7:</span> Staging and Committing</a></li>
<li id="lab_8_link" data-lab-id="8"><a href="lab_08.html"><span>8:</span> Committing Changes</a></li>
<li id="lab_9_link" data-lab-id="9"><a href="lab_09.html"><span>9:</span> Changes, not Files</a></li>
<li id="lab_10_link" data-lab-id="10"><a href="lab_10.html"><span>10:</span> History</a></li>
<li id="lab_11_link" data-lab-id="11"><a href="lab_11.html"><span>11:</span> Aliases</a></li>
<li id="lab_12_link" data-lab-id="12"><a href="lab_12.html"><span>12:</span> Getting Old Versions</a></li>
<li id="lab_13_link" data-lab-id="13"><a href="lab_13.html"><span>13:</span> Tagging versions</a></li>
<li id="lab_14_link" data-lab-id="14"><a href="lab_14.html"><span>14:</span> Undoing Local Changes (before staging)</a></li>
<li id="lab_15_link" data-lab-id="15"><a href="lab_15.html"><span>15:</span> Undoing Staged Changes (before committing)</a></li>
<li id="lab_16_link" data-lab-id="16"><a href="lab_16.html"><span>16:</span> Undoing Committed Changes</a></li>
<li id="lab_17_link" data-lab-id="17"><a href="lab_17.html"><span>17:</span> Removing Commits from a Branch</a></li>
<li id="lab_18_link" data-lab-id="18"><a href="lab_18.html"><span>18:</span> Remove the oops tag</a></li>
<li id="lab_19_link" data-lab-id="19"><a href="lab_19.html"><span>19:</span> Amending Commits</a></li>
<li id="lab_20_link" data-lab-id="20"><a href="lab_20.html"><span>20:</span> Moving Files</a></li>
<li id="lab_21_link" data-lab-id="21"><a href="lab_21.html"><span>21:</span> More Structure</a></li>
<li id="lab_22_link" data-lab-id="22"><a href="lab_22.html"><span>22:</span> Git Internals: The .git directory</a></li>
<li id="lab_23_link" data-lab-id="23"><a href="lab_23.html"><span>23:</span> Git Internals: Working directly with Git Objects</a></li>
<li id="lab_24_link" data-lab-id="24"><a href="lab_24.html"><span>24:</span> Creating a Branch</a></li>
<li id="lab_25_link" data-lab-id="25"><a href="lab_25.html"><span>25:</span> Navigating Branches</a></li>
<li id="lab_26_link" data-lab-id="26"><a href="lab_26.html"><span>26:</span> Changes in Master</a></li>
<li id="lab_27_link" data-lab-id="27"><a href="lab_27.html"><span>27:</span> Viewing Diverging Branches</a></li>
<li id="lab_28_link" data-lab-id="28"><a href="lab_28.html"><span>28:</span> Merging</a></li>
<li id="lab_29_link" data-lab-id="29"><a href="lab_29.html"><span>29:</span> Creating a Conflict</a></li>
<li id="lab_30_link" data-lab-id="30"><a href="lab_30.html"><span>30:</span> Resolving Conflicts</a></li>
<li id="lab_31_link" data-lab-id="31"><a href="lab_31.html"><span>31:</span> Rebasing VS Merging</a></li>
<li id="lab_32_link" data-lab-id="32"><a href="lab_32.html"><span>32:</span> Resetting the Greet Branch</a></li>
<li id="lab_33_link" data-lab-id="33"><a href="lab_33.html"><span>33:</span> Resetting the Master Branch</a></li>
<li id="lab_34_link" data-lab-id="34"><a href="lab_34.html"><span>34:</span> Rebasing</a></li>
<li id="lab_35_link" data-lab-id="35"><a href="lab_35.html"><span>35:</span> Merging Back to Master</a></li>
<li id="lab_36_link" data-lab-id="36"><a href="lab_36.html"><span>36:</span> Multiple Repositories</a></li>
<li id="lab_37_link" data-lab-id="37"><a href="lab_37.html"><span>37:</span> Cloning Repositories</a></li>
<li id="lab_38_link" data-lab-id="38"><a href="lab_38.html"><span>38:</span> Review the Cloned Repository</a></li>
<li id="lab_39_link" data-lab-id="39"><a href="lab_39.html"><span>39:</span> What is Origin?</a></li>
<li id="lab_40_link" data-lab-id="40"><a href="lab_40.html"><span>40:</span> Remote Branches</a></li>
<li id="lab_41_link" data-lab-id="41"><a href="lab_41.html"><span>41:</span> Change the Original Repository</a></li>
<li id="lab_42_link" data-lab-id="42"><a href="lab_42.html"><span>42:</span> Fetching Changes</a></li>
<li id="lab_43_link" data-lab-id="43"><a href="lab_43.html"><span>43:</span> Merging Pulled Changes</a></li>
<li id="lab_44_link" data-lab-id="44"><a href="lab_44.html"><span>44:</span> Pulling Changes</a></li>
<li id="lab_45_link" data-lab-id="45"><a href="lab_45.html"><span>45:</span> Adding a Tracking Branch</a></li>
<li id="lab_46_link" data-lab-id="46"><a href="lab_46.html"><span>46:</span> Bare Repositories</a></li>
<li id="lab_47_link" data-lab-id="47"><a href="lab_47.html"><span>47:</span> Adding a Remote Repository</a></li>
<li id="lab_48_link" data-lab-id="48"><a href="lab_48.html"><span>48:</span> Pushing a Change</a></li>
<li id="lab_49_link" data-lab-id="49"><a href="lab_49.html"><span>49:</span> Pulling Shared Changes</a></li>
<li id="lab_50_link" data-lab-id="50"><a href="lab_50.html"><span>50:</span> Hosting your Git Repositories</a></li>
<li id="lab_51_link" data-lab-id="51"><a href="lab_51.html"><span>51:</span> Sharing Repos</a></li>
<li id="lab_52_link" data-lab-id="52"><a href="lab_52.html"><span>52:</span> Advanced / Future Topics</a></li>
<li id="lab_53_link" data-lab-id="53"><a href="lab_53.html"><span>53:</span> Thank You</a></li>
</ul>
</div>
<div id="cover"></div>
</body>
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