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57 lines
1.3 KiB
Markdown
57 lines
1.3 KiB
Markdown
# Cron
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1. [TL;DR](#tldr)
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1. [Further readings](#further-readings)
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1. [Sources](#sources)
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## TL;DR
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Files in `/etc/cron.hourly` and similar must:
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- Be **scripts**.<br/>
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Normal crontab files will error out.
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- Be **executable**.<br/>
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If not executable, execution will silently fail.
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- Match the Debian cron script namespace (`^[a-zA-Z0-9_-]+$`).<br/>
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Files **with** an extension **won't** work.
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```sh
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systemctl --enable --now 'crond.service'
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journalctl -xefu 'crond.service'
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# Validate crontab files.
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crontab -T '/etc/cron.d/prometheus-backup'
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# List files in given directories.
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# Kinda… useless?
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run-parts --list '/etc/cron.daily'
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# Print the names of the scripts which would be invoked.
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# '--report' is *not* available everywhere.
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run-parts --report --test '/etc/cron.hourly'
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# Manually run crontab files in given directories.
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run-parts '/etc/cron.weekly'
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```
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## Further readings
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- [Crontab]
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### Sources
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- [Function of /etc/cron.hourly]
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- [Use anacron for a better crontab]
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<!--
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Reference
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═╬═Time══
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-->
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<!-- Knowledge base -->
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[crontab]: crontab.md
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<!-- Others -->
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[function of /etc/cron.hourly]: https://askubuntu.com/questions/7676/function-of-etc-cron-hourly#607974
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[use anacron for a better crontab]: https://opensource.com/article/21/2/linux-automation
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