Zabre:

quoted text
> I delete one file in the new branch
> $ git rm d.txt
> $ ls
> a.txt b.txt c.txt

Here you have not yet committed the change, so the change is only in
the staging area. You need to

  git commit

to create a commit on your branch.

quoted text
> Then I go back to the master branch and list the files there
> $ git checkout master

Since you have not yet made any commits to your branch, master and new
both point to the same commit, meaning that this is does nothing but
changes which branch you are committing to.

quoted text
> $ls
> a.txt b.txt c.txt

You are in the same place as you were a moment ago, but you have told
Git that you want to commit the removal to master instead of new.

-- 
\\// Peter - http://www.softwolves.pp.se/
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