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遇到的问题

在仓库中删除文件后，试图直接用

git add .

将所有删除工作提交暂存区，结果遇到了报错：

$ git add .

warning: You ran 'git add' with neither '-A (--all)' or '--ignore-removal',
whose behaviour will change in Git 2.0 with respect to paths you removed.
Paths like '.idea/Wood_Tool.iml' that are
removed from your working tree are ignored with this version of Git.

* 'git add --ignore-removal <pathspec>', which is the current default,
  ignores paths you removed from your working tree.

* 'git add --all <pathspec>' will let you also record the removals.

Run 'git status' to check the paths you removed from your working tree.

经过上网查阅，用

git add --all

解决了问题。

进一步探究

很明显我们需要的是第二种。

实验代码

# 新建仓库并添加文件
$ git init
Initialized empty Git repository in /media/hok/test/.git/
$ git add .
$ git status
On branch master

Initial commit

Changes to be committed:
  (use "git rm --cached <file>..." to unstage)

    new file:   1.txt
    new file:   2.txt
    new file:   3.txt

# 删除文件后尝试用　git add --all
$ rm 1.txt 
$ git add --all
$ git status
On branch master

Initial commit

Changes to be committed:
  (use "git rm --cached <file>..." to unstage)

    new file:   2.txt
    new file:   3.txt

# 删除文件后尝试用　git add . --ignore-removal，则删除操作 依然未被 提交至暂存区
$ rm 2.txt 
$ git add . --ignore-removal
$ git status
On branch master

Initial commit

Changes to be committed:
  (use "git rm --cached <file>..." to unstage)

    new file:   2.txt
    new file:   3.txt

Changes not staged for commit:
  (use "git add/rm <file>..." to update what will be committed)
  (use "git checkout -- <file>..." to discard changes in working directory)

    deleted:    2.txt

$