[git 学习篇] git commit原理 --实践体会

1 现对readme.txt作出修改,增加一行内容: Git has a mutable index called stage.

Git is a distributed version control system.
Git is free software distributed under the GPL.
Git has a mutable index called stage.

2 在工作区新添加一个文件:LICENSE文本文件（内容随便写）

3 通过git status 查看当前的状态

$ git status
# On branch master
# Changes not staged for commit:
#   (use "git add <file>..." to update what will be committed)
#   (use "git checkout -- <file>..." to discard changes in working directory)
#
#       modified:   readme.txt
#
# Untracked files:
#   (use "git add <file>..." to include in what will be committed)
#
#       LICENSE
no changes added to commit (use "git add" and/or "git commit -a")

Git非常清楚地告诉我们，readme.txt被修改了，而LICENSE还从来没有被添加过，所以它的状态是Untracked。

4 git add readme.txt  git add LICENSE( 没有执行git commit)

现在，使用两次命令git add，把readme.txt和LICENSE都添加后，用git status再查看一下：

$ git status
# On branch master
# Changes to be committed:
#   (use "git reset HEAD <file>..." to unstage)
#
#       new file:   LICENSE
#       modified:   readme.txt
# 
git add 就是将文件修改放到存储区

5 执行git commit

执行git commit就可以一次性把暂存区的所有修改提交到分支。

$ git commit -m "understand how stage works"
[master 27c9860] understand how stage works
  files changed,  insertions(+)
 create mode  LICENSE