how to get debian8 shutdown log info

"埃菲尔" <[email protected]>
Newsgroups gmane.linux.debian.devel.www
Message-ID <[email protected]> 
Dear:


     we need to get the shutdown log info, but i can not find them in syslog or message, even in debug level.
     please tell me how to get debian8 shutdown log info. 
     thank you very much.


regards!
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