<h3 id="what">What</h3>
<p>A system daemon to execute task on designed times.</p>
<p><em>daemon</em>: run in linux system. works underlying in background</p>
<p>It's a long-running process to execute command at specifice date/time</p>
<h3 id="how-it-works">How it works</h3>
<p>Using crontab file. A configed text file, contains a list of command to schedule tasks. This file can be edit/ adjust using crontab command</p>
<p><em>Crontab Command</em>: List of action you wish to execute</p>
<h3 id="example">Example</h3>
<p><strong>Format</strong></p>
<ul>
<li>Minute</li>
<li>Hour</li>
<li>Day</li>
<li>Month</li>
<li>Day of the week</li>
<li>Command</li>
</ul>
<p><code>30 09 ** 08 * / home/ramesh/update-db</code></p>
<p>Task: Auto update database at 09:30AM on every day of August</p>
<hr>
<h4 id="reference">Reference</h4>
<ul>
<li><a href="https://ostechnix.com/a-beginners-guide-to-cron-jobs/">https://ostechnix.com/a-beginners-guide-to-cron-jobs/</a></li>
<li><a href="https://www.marksanborn.net/linux/learning-cron-by-example/">https://www.marksanborn.net/linux/learning-cron-by-example/</a></li>
<li><a href="https://www.thegeekstuff.com/2009/06/15-practical-crontab-examples/">https://www.thegeekstuff.com/2009/06/15-practical-crontab-examples/</a></li>
</ul>

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