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67 lines
1.3 KiB
Markdown
67 lines
1.3 KiB
Markdown
# Crontab
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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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> [!caution]
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> Escape the `%` character if used in commands (e.g., in `date`'s formatting), even if in quotes.<br/>
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> Cron interprets `%` as a newline. Everything after it is sent to the command's stdin, not as part of the command.
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```sh
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# List existing jobs.
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crontab -l
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sudo crontab -l -u 'jane'
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# Edit crontab files.
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crontab -e
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sudo crontab -e -u 'mark'
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# Replace the current crontab with the contents of a given file.
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crontab 'path/to/file'
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sudo crontab -u 'kelly' 'path/to/file'
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# Validate crontab files.
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crontab -T '/etc/cron.d/prometheus-backup'
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# Remove all cron jobs.
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crontab -r
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sudo crontab -r -u 'nana'
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```
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```txt
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# Run 'pwd' every day at 10PM.
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0 22 * * * pwd
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# Run 'ls' every 10 minutes.
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*/10 * * * * ls
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# Run a script at 02:34 every Friday.
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# `%` needs escaping even in quotes
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34 2 * * Fri /absolute/path/to/script.sh
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35 3 * * FRI /absolute/path/to/script.sh > /absolute/path/to/script.$(date '+\%F').log
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```
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## Further readings
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- [Cron]
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- [Crontab guru]
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### Sources
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- [cheat.sh]
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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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[cron]: cron.md
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<!-- Others -->
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[cheat.sh]: https://cheat.sh/crontab
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[crontab guru]: https://crontab.guru/
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