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Comment by frizlab | Hacker News Reader

It’s because service was the other way around, I’m sure.

systemd services are named "foo.service", and you do not need to specify the ".service" in almost any case.

They're referring to Debian's service(8) command.

  NAME
       service - run a System V init script
  SYNOPSIS
       service SCRIPT COMMAND [OPTIONS]

(the manpage wasn't updated, but the same command also supports systemd services nowadays)