I would like to see a specific commit in Beyond Compare or any other separate diff tool while viewing it via git show. I tried looking at help of git show/difftool/
git show
Once you have a diff tool set up, like the awesome p4merge, you can do this:
git diff HEAD HEAD~1
Works like a charm.
Similarly if you want to see the commit before that, you can do:
git diff HEAD~1 HEAD~2