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<a aria-hidden="true" tabindex="-1" href="#cron-备忘清单"><span class="icon icon-link"></span></a>Cron 备忘清单</h1><div class="wrap-body">
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<p><a href="https://en.wikipedia.org/wiki/Cron">Cron</a> 最适合安排重复性任务。 可以使用关联的 at 实用程序来完成一次性任务的调度。</p>
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</div></header><div class="h1wrap-body"><div class="wrap"><div class="wrap-header h2wrap"><h2 id="crontab-格式"><a aria-hidden="true" tabindex="-1" href="#crontab-格式"><span class="icon icon-link"></span></a>Crontab 格式</h2><div class="wrap-body">
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<!--rehype:body-class=cols-2-->
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</div></div><div class="h2wrap-body cols-2"><div class="wrap"><div class="wrap-header h3wrap"><h3 id="格式"><a aria-hidden="true" tabindex="-1" href="#格式"><span class="icon icon-link"></span></a>格式</h3><div class="wrap-body">
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<pre><code class="code-highlight"><span class="code-line">Min Hour Day Mon Weekday
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</span><span class="code-line">分钟 小时 天 月 周
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</span></code></pre>
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<hr>
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<pre><code class="code-highlight"><span class="code-line">* * * * * 要执行的命令
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</span><span class="code-line">┬ ┬ ┬ ┬ ┬
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</span><span class="code-line">│ │ │ │ └─ 星期几 (0=周日 .. 6=星期六)
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</span><span class="code-line">│ │ │ └────── 月 (1..12)
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</span><span class="code-line">│ │ └─────────── 月份中的某天 (1..31)
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</span><span class="code-line">│ └──────────────── 小时 (0..23)
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</span><span class="code-line">└───────────────────── 分钟 (0..59)
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</span></code></pre>
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<hr>
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<table class="show-header "><thead><tr><th>字段</th><th>范围</th><th>特殊字符</th></tr></thead><tbody><tr><td>分钟 Minute</td><td>0 - 59</td><td>, - * /</td></tr><tr><td>小时 Hour</td><td>0 - 23</td><td>, - * /</td></tr><tr><td>月份中的某天</td><td>1 - 31</td><td>, - * ? / L W</td></tr><tr><td>月 Month</td><td>1 - 12</td><td>, - * /</td></tr><tr><td>星期几</td><td>0 - 6</td><td>, - * ? / L #</td></tr></tbody></table>
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<!--rehype:className=show-header -->
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</div></div></div><div class="wrap"><div class="wrap-header h3wrap"><h3 id="示例"><a aria-hidden="true" tabindex="-1" href="#示例"><span class="icon icon-link"></span></a>示例</h3><div class="wrap-body">
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<table><thead><tr><th>Example</th><th>Description</th></tr></thead><tbody><tr><td><code>*/15 * * * *</code></td><td>每 15 分钟</td></tr><tr><td><code>0 * * * *</code></td><td>每隔一小时</td></tr><tr><td><code>0 */2 * * *</code></td><td>每 2 小时</td></tr><tr><td><code>15 2 * * *</code></td><td>每天凌晨 2 点 15 分</td></tr><tr><td><code>15 2 * * ?</code></td><td>每天凌晨 2 点 15 分</td></tr><tr><td><code>10 9 * * 5</code></td><td>每周五上午 9:10</td></tr><tr><td><code>0 0 * * 0</code></td><td>每个星期日的午夜</td></tr><tr><td><code>15 2 * * 1L</code></td><td>每月最后一个星期一凌晨 2 点 15 分</td></tr><tr><td><code>15 0 * * 4#2</code></td><td>每个月的第二个星期四早上 00:15</td></tr><tr><td><code>0 0 0 1 * *</code></td><td>每个月的 1 日（每月）</td></tr><tr><td><code>0 0 0 1 1 *</code></td><td>每年 1 月 1 日（每年）</td></tr><tr><td><code>@reboot</code></td><td>每次重启 <em>(非标准)</em></td></tr></tbody></table>
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</div></div></div><div class="wrap"><div class="wrap-header h3wrap"><h3 id="特殊字符串"><a aria-hidden="true" tabindex="-1" href="#特殊字符串"><span class="icon icon-link"></span></a>特殊字符串</h3><div class="wrap-body">
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<table class="show-header "><thead><tr><th>特殊字符串</th><th>意义</th></tr></thead><tbody><tr><td>@reboot</td><td>运行一次，在系统启动时 <em>（非标准）</em></td></tr><tr><td>@yearly</td><td>每年运行一次，“0 0 1 1 *” <em>（非标准）</em></td></tr><tr><td>@annually</td><td>（与@yearly 相同）<em>（非标准）</em></td></tr><tr><td>@monthly</td><td>每月运行一次，“0 0 1 * *” <em>（非标准）</em></td></tr><tr><td>@weekly</td><td>每周运行一次，“0 0 * * 0” <em>（非标准）</em></td></tr><tr><td>@daily</td><td>每天运行一次，“0 0 * * *” <em>（非标准）</em></td></tr><tr><td>@midnight</td><td>（与@daily 相同）<em>（非标准）</em></td></tr><tr><td>@hourly</td><td>每小时运行一次，“0 * * * *” <em>（非标准）</em></td></tr></tbody></table>
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<!--rehype:className=show-header -->
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</div></div></div><div class="wrap"><div class="wrap-header h3wrap"><h3 id="crontab-命令"><a aria-hidden="true" tabindex="-1" href="#crontab-命令"><span class="icon icon-link"></span></a>Crontab 命令</h3><div class="wrap-body">
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<table><thead><tr><th>-</th><th>-</th></tr></thead><tbody><tr><td><code>crontab -e</code></td><td>如果不存在，则编辑或创建一个 crontab 文件。</td></tr><tr><td><code>crontab -l</code></td><td>显示 crontab 文件。</td></tr><tr><td><code>crontab -r</code></td><td>删除 crontab 文件。</td></tr><tr><td><code>crontab -v</code></td><td>显示您上次编辑 crontab 文件的时间。 <em>（非标准）</em></td></tr><tr><td>`echo "@reboot echo hi"</td><td>crontab`</td></tr></tbody></table>
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</div></div></div><div class="wrap col-span-2"><div class="wrap-header h3wrap"><h3 id="特殊字符"><a aria-hidden="true" tabindex="-1" href="#特殊字符"><span class="icon icon-link"></span></a>特殊字符</h3><div class="wrap-body">
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<!--rehype:wrap-class=col-span-2-->
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<table class="show-header "><thead><tr><th>特殊字符</th><th>说明</th></tr></thead><tbody><tr><td><code>星号(*)</code></td><td>匹配字段中的所有值或任何可能的值。</td></tr><tr><td><code>横杆(-)</code></td><td>用于定义范围。例如：第 5 个字段（星期几）中的 1-5 每个工作日，即星期一到星期五</td></tr><tr><td><code>斜线 (/)</code></td><td>第一个字段（分钟）/15 表示每十五分钟或范围的增量。</td></tr><tr><td><code>逗号(,)</code></td><td>用于分隔项目。例如：第二个字段（小时）中的 2、6、8 在凌晨 2 点、早上 6 点和早上 8 点执行</td></tr><tr><td><code>L</code></td><td>仅允许用于 <code>月份中的某天</code> 或 <code>星期几</code> 字段，<code>星期几</code> 中的 <code>2L</code> 表示每个月的最后一个星期二</td></tr><tr><td><code>井号 (#)</code></td><td>仅允许用于 <code>星期几</code> 字段，后面必须在 1 到 5 的范围内。例如，<code>4#1</code> 表示给定月份的“第一个星期四”。</td></tr><tr><td><code>问号(?)</code></td><td>可以代替“*”并允许用于月份和星期几。使用仅限于 cron 表达式中的 <code>月份中的某天</code> 或 <code>星期几</code>。</td></tr></tbody></table>
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<!--rehype:className=show-header -->
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</div></div></div></div></div><div class="wrap"><div class="wrap-header h2wrap"><h2 id="also-see"><a aria-hidden="true" tabindex="-1" href="#also-see"><span class="icon icon-link"></span></a>Also see</h2><div class="wrap-body">
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<ul>
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<li><a href="https://devhints.io/cron">Devhints</a> <em>(devhints.io)</em></li>
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<li><a href="https://crontab-generator.org/">Crontab Generator</a> <em>(crontab-generator.org)</em></li>
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<li><a href="https://crontab.guru/">Crontab guru</a> <em>(crontab.guru)</em></li>
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</ul>
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</div></div></div></div></div><footer class="footer-wrap"><footer class="max-container">© 2022 Kenny Wang, All rights reserved.</footer></footer></body>
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