Make sure you have gitk installed:
$ which gitk /usr/local/bin/gitk
If nothing shows up, then gitk is not installed on your system, or at least is not available on your $PATH.
Change the directory to the Git-Version-Control-Cookbook-Second-Edition repository from the objects and DAG examples. Make sure the master branch is checked out and pointing to 13dcad:
$ git checkout master && git reset --hard 13dcad
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