I'm sure this will become a more and more relevant question as the advent of Docker's reign comes to fruition (Hail the whale!). I've isolated my Postgres instance to a Docker container for development purposes. I hate actually creating users on my system, and having to go kill start up commands that I didn't really want.
Now my problem is, I'm trying to work with Ecto and Ecto needs psql to do what it does. How do I install psql and not the whole elephant? I imagine the best answer would tackle Linux, Windows, and Mac, but I'm most interested in Mac OS X as there doesn't seem to be a brew formula for installing just psql.