1 git add -u（只暂存不提交） 或 git commit -a
git help rm
Using “git commit -a”
If you intend that your next commit should record all modifications of tracked files in the working tree and record all removals of files that have been
removed from the working tree with rm (as opposed to git rm), use git commit -a, as it will automatically notice and record all removals. You can also have
a similar effect without committing by using git add -u.
2 git add -A 暂存所有删除，修改和新增
Using “git add -A”
When accepting a new code drop for a vendor branch, you probably want to record both the removal of paths and additions of new paths as well as
modifications of existing paths.
Typically you would first remove all tracked files from the working tree using this command:
git ls-files -z | xargs -0 rm -f
and then untar the new code in the working tree. Alternately you could rsync the changes into the working tree.
After that, the easiest way to record all removals, additions, and modifications in the working tree is:
git add -A
See git-add(1).
