[CentOS] shutdown or poweroff?

Sun Feb 4 16:03:20 UTC 2018
Walter H. <Walter.H at mathemainzel.info>

Hello,

just a simple question, my router has CentOS 6 with the apcupsd running, 
in the log of
apcupsd I see this:

2018-02-01 19:05:54 +0100  apcupsd 3.14.12 (29 March 2014) redhat 
startup succeeded
2018-02-04 15:52:43 +0100  Power failure.
2018-02-04 15:52:49 +0100  Running on UPS batteries.
2018-02-04 15:53:00 +0100  Reached remaining time percentage limit on 
batteries.
2018-02-04 15:53:00 +0100  Initiating system shutdown!
2018-02-04 15:53:00 +0100  User logins prohibited
2018-02-04 15:53:37 +0100  apcupsd exiting, signal 15
2018-02-04 15:53:37 +0100  apcupsd shutdown succeeded

does this mean the shutdown was successfull?
is there other log where I can verify this: because shutting down squid 
takes almost a minute or so ...

Thanks,
Walter