reference http://0pointer.de/blog/projects/systemd-for-admins-3.html
In this blog
"
Note that a dependency of type After= only encodes the suggested ordering, but
does not actually cause syslog to be started when abrtd is -- and this is
exactly what we want, since abrtd actually works fine even without syslog being
around. However, if both are started (and usually they are) then the order in
which they are is controlled with this dependency.
"
what's the meaning of "--" ?
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