README is from welcome.txt:

README

@@ -1,2 +1,3 @@
 Hello.
 Nice to meet you.
+README

hello.h

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+#include <stdio.h>

notes/2.8-git-gui.md

@@ -98,3 +98,55 @@ git cat-file -p D^0 # 展示里程碑D及其提交
 
 ### 2.8.4.4 git diff
 
+```bash
+git diff B A # 比较B和A里程碑
+git diff A # 比较工作区和里程碑A
+git diff --cached A
+git diff
+git diff --cached 
+git diff HEAD
+```
+
+```bash
+git diff --word-diff
+```
+
+### 2.8.4.5 git blame
+
+可以追溯指出是谁在什么时候，什么版本引入的代码
+
+```
+git blame <filename>
+git blame -L <n,m> <filename> # 查看某几行
+```
+
+### 2.8.4.6 git bisect
+
+用于二分查找什么时候引入的代码
+```bash
+git bisect start # 开始二分查找
+git bisect bad # 设置当前版本为坏版本
+git bisect good G # 设置里程碑G为好版本
+git bisect reset # 结束
+```
+
+标记错误，恢复
+```bash
+git bisect log > logfile # 打开logfile，删除标记错误的行
+git bisect reset
+git bisect replay logfile # 用logfile恢复进度
+```
+
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+

test

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+test