How to tell which version of a application is running

[Chris]

I have two versions of tracker installed, one through the system
install of 16.04LTS

apt-cache policy tracker
tracker:
  Installed: 1.6.2-0ubuntu1.1
  Candidate: 1.6.2-0ubuntu1.1
  Version table:
 *** 1.6.2-0ubuntu1.1 500

The other,

tracker --version
Tracker 1.12.0

I installed from source recently hoping to stop tracker from filling up
my syslog with notations such as I've posted here - https://pastebin.co
m/rWpuwgEJ every time I restart the system when required (although it
hasn't stopped as you can see by the date in the log entries).

Question is, which version of tracker is running? Is it 1.6.2 located
in 

which -a tracker
/usr/local/bin/tracker
/usr/bin/tracker

/usr/bin$ ls -l tracker
-rwxr-xr-x 1 root root 115296 Oct 11  2016 tracker

or 1.12.0 located

/usr/local/bin$ ls -l tracker
-rwxr-xr-x 1 root root 410160 Apr  1 14:20 tracker

Does the version located in /usr/local/bin take precedence over the
version located in /usr/bin?

Please, only helpful replies.

Thanks
Chris

-- 
Chris
KeyID 0xE372A7DA98E6705C
31.11972; -97.90167 (Elev. 1092 ft)
06:40:38 up 9:30, 1 user, load average: 0.28, 0.35, 0.41
Description:	Ubuntu 16.04.2 LTS, kernel 4.4.0-72-generic
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