re-reading a config file

[Rusty]

Isn't there some way to get a service to re-read its configuration file
OTHER than stopping and restarting the service? I seem to remember that
being a possibility, but can't remember the command(s) that work. (I
know this isn't a lot of information, but I was having a discussion
with a friend, had some memory of this being possible, but can't
remember any details.) TIA for any help.

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