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Jag Talon
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Merge pull request #463 from nkorth/master
Added crontab cheat sheet goodie
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‎lib/DDG/Goodie/CrontabCheatSheet.pm‎

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package DDG::Goodie::CrontabCheatSheet;
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# ABSTRACT: Some examples of crontab syntax
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# Adapted from VimCheatSheet.pm
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use DDG::Goodie;
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zci answer_type => "cron_cheat";
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name "CrontabCheatSheet";
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description "Crontab cheat sheet";
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code_url "https://github.com/duckduckgo/zeroclickinfo-goodies/blob/master/lib/DDG/Goodie/CrontabCheatSheet.pm";
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category "cheat_sheets";
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topics "computing", "geek", "programming", "sysadmin";
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primary_example_queries 'crontab help', 'crontab cheat sheet', 'crontab example';
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triggers startend => (
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'cron cheat sheet',
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'cron cheatsheet',
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'cron guide',
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'cron help',
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'cron quick reference',
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'cron reference',
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'cron example',
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'cron examples',
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'crontab cheat sheet',
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'crontab cheatsheet',
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'crontab guide',
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'crontab help',
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'crontab quick reference',
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'crontab reference',
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'crontab example',
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'crontab examples'
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);
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attribution github => ["nkorth", "Nathan Korth"];
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handle remainder => sub {
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return
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heading => 'Cron Cheat Sheet',
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html => html_cheat_sheet(),
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answer => text_cheat_sheet(),
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};
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my $HTML;
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sub html_cheat_sheet {
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$HTML //= share("crontab_cheat_sheet.html")
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->slurp(iomode => '<:encoding(UTF-8)');
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return $HTML;
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}
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my $TEXT;
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sub text_cheat_sheet {
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$TEXT //= share("crontab_cheat_sheet.txt")
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->slurp(iomode => '<:encoding(UTF-8)');
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return $TEXT;
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}
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1;

‎share/goodie/crontab_cheat_sheet/crontab_cheat_sheet.html‎

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<style type="text/css">
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.zci--answer .crontab-container {
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max-height: 23.3ex;
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overflow-y: auto;
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}
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.zci--answer .crontab-container .crontab-column {
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width: 48%;
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display: inline-block;
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vertical-align:top;
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}
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.zci--answer .crontab-container .crontab-column:first-child {
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margin-right: 3%;
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}
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.zci--answer .crontab-container p,
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.zci--answer .crontab-container .crontab-column {
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padding-top: 0;
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padding-bottom: 2ex;
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}
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.zci--answer .crontab-container table {
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width: 100%;
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}
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.zci--answer .crontab-container th {
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font-weight: bold;
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}
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.zci--answer .crontab-container td {
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vertical-align: top;
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}
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.zci--answer .crontab-container dd {
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margin-bottom: 1ex;
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}
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@media(max-width: 704px) {
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.zci--answer .crontab-container .crontab-column {
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width: 100%;
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margin-right: 0;
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display: block;
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}
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}
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</style>
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<div class="crontab-container">
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<div class="crontab-column">
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<p>Commands are executed by cron when the minute, hour, and month
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fields match the current time, and at least one of the two day fields
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(day of month, or day of week) match the current time. A field may be
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an asterisk (<code>*</code>), which will always match.</p>
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<table>
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<tr><th>Field</th><th>Allowed values</th>
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<tr><td>minute</td><td>0-59</td></tr>
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<tr><td>hour</td><td>0-23</td></tr>
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<tr><td>day of month</td><td>1-31</td></tr>
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<tr><td>month</td><td>1-12 or first three letters</td></tr>
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<tr><td>day of week</td><td>0-7 or first three letters<br>(0 or 7 is Sunday)</td></tr>
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</table>
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</div>
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<div class="crontab-column">
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<b>Examples</b>
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<dl>
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<dt>Run every Tuesday at 2:30</dt>
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<dd><code>30 2 * * tue /path/to/command</code></dd>
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<dt>Run every 10 minutes</dt>
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<dd><code>*/10 * * * * /path/to/command</code></dd>
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<dt>Run every 2 hours, on the half hour</dt>
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<dd><code>30 */2 * * * /path/to/command</code></dd>
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<dt>Run every 2 hours, on the half hour, but only on weekdays</dt>
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<dd><code>30 */2 * * 1-5 /path/to/command</code></dd>
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<dt>Run at 12:05, 13:05, ..., and 18:05</dt>
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<dd><code>5 12-18 * * * /path/to/command</code></dd>
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<dt>Run at 12:05, 14:05, 16:05, and 18:05</dt>
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<dd><code>5 12-18/2 * * * /path/to/command</code></dd>
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<dt>Run on the first day of every month, at midnight</dt>
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<dd><code>0 0 1 * * /path/to/command</code></dd>
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<dt>Run on the first day of every third month, at midnight</dt>
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<dd><code>0 0 1 */3 * /path/to/command</code></dd>
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</dl>
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</div>
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</div>

‎share/goodie/crontab_cheat_sheet/crontab_cheat_sheet.txt‎

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# Commands are executed by cron when the minute, hour, and month of year
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# fields match the current time, and at least one of the two day fields
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# (day of month, or day of week) match the current time. A field may be
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# an asterisk (*), which will always match.
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#
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# Fields in order:
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# minute (0-59)
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# hour (0-23)
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# day of month (1-31)
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# month (1-12 or first three letters)
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# day of week (0-7 or first three letters; 0 or 7 is Sunday)
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# Run every Tuesday at 2:30am
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30 2 * * tue /path/to/command
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# or
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30 2 * * 2 /path/to/command
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# Run every 10 minutes
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*/10 * * * * /path/to/command
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# Run every 2 hours, on the half-hour
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30 */2 * * * /path/to/command
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# Run every 2 hours on the half hour, but only on weekdays
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30 */2 * * 1-5 /path/to/command
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# Run at 12:05, 13:05, ..., and 18:05
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5 12-18 * * * /path/to/command
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# Run at 12:05, 14:05, 16:05, and 18:05
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5 12-18/2 * * * /path/to/command
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# Run on the first day of every month, at 12:00am
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0 0 1 * * /path/to/command
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# Run on the first day of every third month, at 12:00am
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0 0 1 */3 * /path/to/command

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