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I found only one related question, but I don't feel the answer to that question helps me, the answers are too generic and broad.

I'm currently on and learning about Debian 11.3. How do I know which command to use in which case?

I don't know what other information I would need to include for this question. I'll update the question if needed.

Thibauld nuyten
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  • One of the quoted code blocks in my answer is literally: `case "${ACTION}" in restart|status) exec systemctl $sctl_args ${ACTION} ${UNIT} ;;` i.e. `systemctl restart ...` is executed by `service ... restart`. – muru Apr 18 '22 at 18:24

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service ssh restart is a wrapper around systemctl restart ssh -- when you use the service command, it runs the systemctl command.

The service commands were written at a time when it was common for different distributions to have different ways of launching services (aka daemons). The service commands didn't care which way things were launched, and it created a uniform way of starting, stopping or restarting services. These days, most systems run systemd, which means that systemctl is available almost everywhere. It basically doesn't matter which one you use.

Barton Chittenden
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