I recently learned about the git absorb command. It is interesting in
its own right, but I bring it up because it isn't a command that is built in to
git. When I was looking at the installation instructions for it, it didn't say
anything about how to register the command with git.
How is git supposed to know about it? How do you extend git with custom commands?
What I learned exploring those questions is that git will execute any command
on your path with a git-<command> naming convention.
So, if I create a executable binary called git-taco, add it to my path, and
then run git taco (notice, no dash when I run it), git will run my custom
binary.
In the same way, if you download git-absorb and add it to your path, git
will run it for you when you enter git absorb ....
You can even type something like where git- and then hit tab to prompt your
shell to display a list of a varity of other git commands, most of which
probably ship with git.