How to tell which version of a application is running

[J]

Ummm,, why not just check with Apt to see where it installed the
ubuntu package version??

bladernr at galactica:~/development/git/$ dpkg -L tracker
/.
/usr
/usr/bin
/usr/bin/tracker-import
/usr/bin/tracker-sparql
/usr/bin/tracker-tag
/usr/bin/tracker-control
/usr/bin/tracker-stats
/usr/bin/tracker-info
/usr/bin/tracker
/usr/bin/tracker-search
. . .

Looks to me like the ubuntu package installs everything into /usr/bin
and never touches /usr/local/bin

bladernr at galactica:~/development/git/$ 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
        500 http://archive.ubuntu.com/ubuntu xenial-updates/universe
amd64 Packages
        500 http://security.ubuntu.com/ubuntu xenial-security/universe
amd64 Packages
        100 /var/lib/dpkg/status
     1.6.2-0ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu xenial/universe amd64 Packages