git diff 命令

git diff 命令比较文件的不同，即比较文件在暂存区和工作区的差异。

git diff 命令显示已写入暂存区和已经被修改但尚未写入暂存区文件对区别。

git diff 有两个主要的应用场景。

• 尚未缓存的改动：git diff
• 查看已缓存的改动： git diff --cached
• 查看已缓存的与未缓存的所有改动：git diff HEAD
• 显示摘要而非整个 diff：git diff --stat

显示暂存区和工作区的差异:

$ git diff [file]

显示暂存区和上一次提交(commit)的差异:

$ git diff --cached [file]
或
$ git diff --staged [file]

显示两次提交之间的差异:

$ git diff [first-branch]...[second-branch]

在 hello.php 文件中输入以下内容：

<?php
echo 'runoops教程：runoops.com';
?>

使用 git status 查看状态：

$ git status -s
A  README
AM hello.php
$ git diff
diff --git a/hello.php b/hello.php
index e69de29..69b5711 100644
--- a/hello.php
+++ b/hello.php
@@ -0,0 +1,3 @@
+<?php
+echo 'runoops教程：runoops.com';
+?>

git status 显示你上次提交更新后的更改或者写入缓存的改动， 而 git diff 一行一行地显示这些改动具体是啥。

接下来我们来查看下 git diff --cached 的执行效果：

$ git add hello.php
$ git status -s
A  README
A  hello.php
$ git diff --cached
diff --git a/README b/README
...