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Seen many nginx tutorials omit a pretty critical (IMO) command before applying/reloading config changes: nginx -t.

nginx -t will quickly tell you if you've screwed something up before actually trying to apply changes.

`service nginx configtest` does the same thing.

That's good to know too, yes, but using the nginx binary itself to test is always available, whilst a service command normally involves an init script, systemd config file or similar to be available, and they can vary between packages and distributions.

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