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+<title>Back up OS X app icons</title>
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+<h1 class="article-title">Back up OS X app icons</h1>
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+<time class="article-timestamp" datetime="2015-03-22T16:58:50-0700">March 22, 2015</time>
+</div>
+</header>
+<p>OS X application icons are valuable assets, and it's interesting to see how they evolve over time. This is especially the case when we upgraded to OS X 10.10 Yosemite, when Apple and many design-aware third party developers overhauled (mainly flattened) their icons.</p>
+<p>However, we lose all the old icons when we do a major OS upgrade. Technically they still live in Time Machine backups, but those are a pain to pull out. Therefore, I wrote a script just now to back up app icons of all applications living in <code>/Applications</code> (including those symlinked to <code>/Applications</code>, e.g., apps installed through <code>brew cask</code>) and its level-one subdirectories, and <code>/System/Library/CoreServices</code> (for <code>Finder.app</code> and such). Here's the script:</p>
+<div class="sourceCode"><pre class="sourceCode bash"><code class="sourceCode bash"><span class="co">#!/usr/bin/env bash</span>
+<span class="kw">function</span><span class="fu"> app_version</span>
+<span class="kw">{</span>
+    <span class="co"># $1 is the path to the app</span>
+    <span class="ex">/usr/libexec/PlistBuddy</span> -c <span class="st">"print CFBundleShortVersionString"</span> <span class="st">"</span><span class="va">$1</span><span class="st">"</span>/Contents/Info.plist <span class="op">2&gt;</span>/dev/null <span class="kw">||</span> <span class="fu">date</span> +%Y%m%d
+<span class="kw">}</span>
+
+<span class="kw">function</span><span class="fu"> app_icon_path</span>
+<span class="kw">{</span>
+    <span class="co"># $1 is the path to the app</span>
+    <span class="va">filename=$(</span><span class="ex">/usr/libexec/PlistBuddy</span> -c <span class="st">"print CFBundleIconFile"</span> <span class="st">"</span><span class="va">$1</span><span class="st">"</span>/Contents/Info.plist <span class="op">2&gt;</span>/dev/null<span class="va">)</span>
+    [[ <span class="ex">-n</span> <span class="va">${filename}</span> ]] <span class="kw">||</span> <span class="bu">return</span>
+    <span class="va">filename=$(</span><span class="fu">basename</span> <span class="st">"</span><span class="va">${filename}</span><span class="st">"</span> .icns<span class="va">)</span>
+    <span class="bu">echo</span> <span class="st">"</span><span class="va">$1</span><span class="st">/Contents/Resources/</span><span class="va">${filename}</span><span class="st">.icns"</span>
+<span class="kw">}</span>
+
+<span class="kw">function</span><span class="fu"> process_app</span>
+<span class="kw">{</span>
+    <span class="co"># $1 is the path to the app</span>
+    <span class="va">name=$(</span><span class="fu">basename</span> <span class="st">"</span><span class="va">$1</span><span class="st">"</span> .app <span class="kw">|</span> <span class="fu">tr</span> -d <span class="st">' '</span><span class="va">)</span>
+    <span class="va">path=$(</span><span class="ex">realpath</span> -e <span class="st">"</span><span class="va">$1</span><span class="st">"</span><span class="va">)</span> <span class="kw">||</span> <span class="kw">{</span> <span class="bu">echo</span> <span class="st">"</span><span class="va">${RED}</span><span class="st">error: broken link '</span><span class="va">${path}</span><span class="st">'</span><span class="va">${RESET}</span><span class="st">"</span> <span class="op">&gt;&amp;2</span><span class="kw">;</span> <span class="bu">return</span> 1<span class="kw">;</span> <span class="kw">}</span>
+    <span class="va">version=$(</span><span class="ex">app_version</span> <span class="st">"</span><span class="va">${path}</span><span class="st">"</span><span class="va">)</span>
+    <span class="va">icon_path=$(</span><span class="ex">app_icon_path</span> <span class="st">"</span><span class="va">${path}</span><span class="st">"</span><span class="va">)</span>
+    [[ <span class="ex">-n</span> <span class="va">${icon_path}</span> ]] <span class="kw">||</span> <span class="kw">{</span> <span class="bu">echo</span> <span class="st">"</span><span class="va">${YELLOW}</span><span class="st">warning: '</span><span class="va">$1</span><span class="st">' has no app icon</span><span class="va">${RESET}</span><span class="st">"</span><span class="kw">;</span> <span class="bu">return</span> 1<span class="kw">;</span> <span class="kw">}</span>
+    [[ <span class="ex">-f</span> <span class="va">${icon_path}</span> ]] <span class="kw">||</span> <span class="kw">{</span> <span class="bu">echo</span> <span class="st">"</span><span class="va">${RED}</span><span class="st">error: '</span><span class="va">${icon_path}</span><span class="st">' does not exist</span><span class="va">${RESET}</span><span class="st">"</span> <span class="op">&gt;&amp;2</span><span class="kw">;</span> <span class="bu">return</span> 1<span class="kw">;</span> <span class="kw">}</span>
+    <span class="fu">cp</span> <span class="st">"</span><span class="va">${icon_path}</span><span class="st">"</span> <span class="st">"</span><span class="va">${name}</span><span class="st">-</span><span class="va">${version}</span><span class="st">.icns"</span>
+    <span class="bu">echo</span> <span class="st">"</span><span class="va">${name}</span><span class="st">-</span><span class="va">${version}</span><span class="st">.icns"</span>
+<span class="kw">}</span>
+
+<span class="fu">find</span> /Applications -maxdepth 2 -name <span class="st">'*.app'</span> <span class="kw">|</span> <span class="kw">while</span> <span class="bu">read</span> <span class="va">app</span>; <span class="kw">do</span> <span class="ex">process_app</span> <span class="st">"</span><span class="va">${app}</span><span class="st">"</span><span class="kw">;</span> <span class="kw">done</span>
+<span class="fu">find</span> /System/Library/CoreServices -maxdepth 1 -name <span class="st">'*.app'</span> <span class="kw">|</span> <span class="kw">while</span> <span class="bu">read</span> <span class="va">app</span>; <span class="kw">do</span> <span class="ex">process_app</span> <span class="st">"</span><span class="va">${app}</span><span class="st">"</span><span class="kw">;</span> <span class="kw">done</span></code></pre></div>
+<p>The script is also available as a <a href="https://gist.github.com/zmwangx/fad97e085045a21ebc1d">gist</a>.</p>
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