为什么“gitstatus”显示我在master分支上，而“gitbranch”不在新创建的存储库中？

我正在尝试使过程自动化并发出git branch命令以找出我所在的分支。除了新初始化的存储库git branch什么都不返回以外，其他一切都工作正常。鉴于我对仓库没有做任何事情，甚至没有执行最初的提交，我都可以接受答案。但是，如果我运行git status它，它会告诉我我在master分支上，如下所示：

$ mkdir todelete
$ cd todelete
$ git init
Initialized empty Git repository in /u/u70021a/todelete/.git
$ git status
On branch master

No commits yet

nothing to commit (create/copy files and use "git add" to track)
$ git branch
$

难道我做错了什么？有没有我没有正确设置的设置？

我对Git也有很多新人，我无法向他们解释为什么显示他们所在的分支的命令什么都没显示，而status命令却显示。

I upvoted two other answers, but I think the way to think of this is simple: You can be on a branch that doesn't exist. That's normal in a new empty repository, too, because for a branch name to exist, that branch name must identify the hash ID of an existing, valid commit. A new empty repository has no commits, so no branch names are allowed to exist yet.

Nonetheless, you are, initially, on some branch. The branch you are on is the one whose name is stored in the special name HEAD. In a new, empty repository, Git stores the name master (more precisely, refs/heads/master—the full name of the branch) in HEAD, so you are on master, while master does not exist.

You can change which non-existent branch you are on using git checkout -b:

$ git init
Initialized empty Git repository in [path]
$ git checkout -b asdf
Switched to a new branch 'asdf'
$ git checkout -b hello
Switched to a new branch 'hello'

Whenever you are on a branch that does not exist, the next commit you make creates the branch. This is also how git checkout --orphan works.