windows下git的安装、配置与操作（二）——文件修改

我们已经成功地添加并提交了一个readme.txt文件。我们修改文件内容：

Hello World!
this is a git file.
this file will commit to git.

现在，运行git status命令看看结果：

$ 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

no changes added to commit (use "git add" and/or "git commit -a")

git status命令可以让我们时刻掌握仓库当前的状态，命令提示显示readme.txt被修改过了，但还没有准备提交的修改。

通过git diff可以查看修改的内容：

$ git diff readme.txt
diff --git a/readme.txt b/readme.txt
index 7408b40..820962d 100644
--- a/readme.txt
+++ b/readme.txt
@@ -1,2 +1,3 @@
-Hello World~
-this is git.
\ No newline at end of file
+Hello World!
+this is a git file.
+this file will commit to git.
\ No newline at end of file

提交修改和提交新文件是一样的两步，第一步是git add：

$ git add readme.txt

通过git status看看当前仓库的状态：

$ git status
On branch master
Changes to be committed:
  (use "git reset HEAD <file>..." to unstage)

        modified:   readme.txt

git status告诉我们，将要被提交的修改包括readme.txt，下一步，就可以放心地提交了：

$ git commit -m "modified readme.txt"
[master d23df46] modified readme.txt
 1 file changed, 3 insertions(+), 2 deletions(-)

提交后，我们再用git status命令看看仓库的当前状态：

$ git status
On branch master
nothing to commit, working directory clean

参考文章：时光穿梭机