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<!-- begin _includes/seo.html --><title>Hot-Reload Long Running Shell Scripts (feat. trap / kill) - Şahin Akkaya’s Personal Page</title>
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<meta name="description" content="trap them and kill them!">
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<meta name="description" content="trap them and kill them! There is a beautiful command in Linux called trap which traps signals and let you run specific commands when they invoked. There is also good ol’ kill command which not only kills processes but allows you to specify a signal to send. By combining these two, you can run specific functions from your scripts any time!">
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<meta name="author" content="Şahin Akkaya">
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<meta property="og:description" content="trap them and kill them!">
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<meta property="og:description" content="trap them and kill them! There is a beautiful command in Linux called trap which traps signals and let you run specific commands when they invoked. There is also good ol’ kill command which not only kills processes but allows you to specify a signal to send. By combining these two, you can run specific functions from your scripts any time!">
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<article class="page" itemscope itemtype="https://schema.org/CreativeWork">
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<meta itemprop="headline" content="Hot-Reload Long Running Shell Scripts (feat. trap / kill)">
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<meta itemprop="description" content="trap them and kill them!">
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<meta itemprop="description" content="trap them and kill them!There is a beautiful command in Linux called trap which traps signals and let you run specific commands when they invoked. There is also good ol’ kill command which not only kills processes but allows you to specify a signal to send. By combining these two, you can run specific functions from your scripts any time!">
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<meta itemprop="datePublished" content="2023-01-15T21:48:08+00:00">
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<section class="page__content" itemprop="text">
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<h2 id="trap-them-and-kill-them"><code class="language-plaintext highlighter-rouge">trap</code> them and <code class="language-plaintext highlighter-rouge">kill</code> them!</h2>
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<h2 id="trap-them-and-kill-them">
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<code class="language-plaintext highlighter-rouge">trap</code> them and <code class="language-plaintext highlighter-rouge">kill</code> them!</h2>
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<p>There is a beautiful command in Linux called <a href="https://man7.org/linux/man-pages/man1/trap.1p.html"><code class="language-plaintext highlighter-rouge">trap</code></a> which <em>trap</em>s signals and let you run specific commands when they invoked. There is also good ol’ <a href="https://man7.org/linux/man-pages/man1/kill.1.html"><code class="language-plaintext highlighter-rouge">kill</code></a> command which not only kills processes but allows you to specify a signal to send. By combining these two, you can run specific functions from your scripts any time!</p>
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<h3 id="basic-example">Basic Example</h3>
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<p>I think I am started to getting obsessed with <code class="language-plaintext highlighter-rouge">trap</code> command because it has such a good name and purpose. FOSS people are really on another level when it comes to naming. Here is another good one:</p>
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<blockquote>
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<p>- How can you see the contents of a file? <br />
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+ You <em><code class="language-plaintext highlighter-rouge">cat</code></em> it. <br />
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- What if you want to see them in reverse order? <br />
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+ You <em><code class="language-plaintext highlighter-rouge">tac</code></em> it. <br /></p>
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<p>- How can you see the contents of a file? <br>
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+ You <em><code class="language-plaintext highlighter-rouge">cat</code></em> it. <br>
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- What if you want to see them in reverse order? <br>
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+ You <em><code class="language-plaintext highlighter-rouge">tac</code></em> it. <br></p>
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</blockquote>
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<p>No, it is not just a joke. Try it… Man I love Gnoo slash Linux.</p>
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@ -783,13 +778,15 @@ Last week, I received an email from Let’s Encrypt reminding me to renew my cer
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@ -811,7 +808,7 @@ Last week, I received an email from Let’s Encrypt reminding me to renew my cer
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<div class="page__footer-copyright">© 2023 Şahin Akkaya's Personal Page. Powered by <a href="https://jekyllrb.com" rel="nofollow">Jekyll</a> & <a href="https://mademistakes.com/work/minimal-mistakes-jekyll-theme/" rel="nofollow">Minimal Mistakes</a>.</div>
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<div class="page__footer-copyright">© 2023 Şahin Akkaya's Personal Page. Powered by <a href="https://jekyllrb.com" rel="nofollow">Jekyll</a> & <a href="https://mademistakes.com/work/minimal-mistakes-jekyll-theme/" rel="nofollow">Minimal Mistakes</a>.</div>
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