--branches: Pretend as if all the refs in $GIT_DIR/refs/heads are listed on the command line as
The Git community book that is (according to the website) "meant to help you to learn how to use GIT as quickly and easily as possible" start in the first chapter with a detailed explanation of the internal GIT data model instead of explaining fundamental principles of DSCM und Git. WTF? To be fair, there is a set of other documentation artefacts on the website that appear to be significantly better for starters though.
p.s.: 5min after I wrote this article, I figured, that Martin Fowler wrote an article yesterday about VCS;