Where am I? * (no branch)

问题

I've been getting familiar with creating, merging and deleting branches. I like to know where I am so I don't commit work into the wrong branch. I use git branch -a to see which branches I have. I think the asterix * shows which branch I'm currently on. What does it mean when I get:

* (no branch)
master
origin/HEAD

Because when I $git checkout mybranch I expect to see

* mybranch
master
origin/HEAD

回答1:

The git checkout man page does mention, for the branch name argument:

<branch>

Branch to checkout;

• if it refers to a branch (i.e., a name that, when prepended with "refs/heads/", is a valid ref), then that branch is checked out.
• Otherwise, if it refers to a valid commit, your HEAD becomes "detached" and you are no longer on any branch.

So instead of having checked out a branch name, you must have checked out a tag name (valid commit), making your HEAD a detached one.

回答2:

It doesn't look like you have a branch called mybranch. If you want to create a branch that points to the current head, use git branch foo.

If you want one that points to another ref, use git checkout -b newbranch <ref>

来源：https://stackoverflow.com/questions/2743640/where-am-i-no-branch