In Synaptic I installed cogito (and therefore git), and gitk (gui).
I'm going to follow the advice on the Git Cogito page:
If you want to start to use Git and are considering Cogito, the best way to go about it is to first learn Cogito, then pick up Git commands if you need to do something extraordinary.
For quick introduction to Cogito, follow the Git Crash Courses – they are presenting Cogito commands.
So I cd'd to my project dir and did:
cg init
This is the equivalent in svn to both creating the repository (which is now local!!! although I can "push" my stuff to a centralized directory somewhere) and doing the initial import. I make the initial comment, save the file and exit).
Then I made a change in a binary document file, and did:
cg commit
Typed in "modifiqué sección 3.6 Ambientes del Usuario" and saved and exited. Then saw my changes: