1、git clone
功能：克隆git仓。
格式：git clone url
用法：
## clone rockpi代码，下载完成后，代码存储在rockchip-bsp文件夹
git clone --recursive https://github.com/radxa/rockchip-bsp.git
## clone rockpi代码，下载完成后，代码存储在rockpi文件夹
git clone --recursive https://github.com/radxa/rockchip-bsp.git rockpi
clone完成后，已经存在git仓。
如果本地代码没有git仓，可使用git init命令初始化空的git仓。
2、git init
功能：初始化本地仓，命令执行完后生成.git文件夹。用于新建本地git仓，进行代码管理。
格式：git init
用法：
root@ubuntu:/home/run/code/libdrm-2.4.89# git init
Initialized empty Git repository in /home/run/code/libdrm-2.4.89/.git/
3、git status
功能：检查当前文件状态。
格式：git status
用法：
root@ubuntu:/home/run/code/libdrm-2.4.89# git status
On branch master
No commits yet
Untracked files:
(use "git add <file>..." to include in what will be committed)
Makefile.am
Makefile.in
Makefile.sources
README
aclocal.m4
amdgpu/
...
注：由于是本地新建git仓，此时文件属于Untracked状态。
4、git add
功能：跟踪文件。
格式：git add
用法：
root@ubuntu:/home/run/code/libdrm-2.4.89# git add .
root@ubuntu:/home/run/code/libdrm-2.4.89# git status
On branch master
No commits yet
Changes to be committed:
(use "git rm --cached <file>..." to unstage)
new file: Makefile.am
new file: Makefile.in
new file: Makefile.sources
new file: README
new file: aclocal.m4
new file: amdgpu/Makefile.am
注：
1）git add filename：跟踪名为filename的文件。
2）git add -u：跟踪被修改或删除文件，不包括新增文件。
3）git add .：跟踪所有变化，等同git add -A。
## 1.删除git仓中的README，新增加readme.txt
root@ubuntu:/home/run/code/test/libdrm-2.4.89# rm README
root@ubuntu:/home/run/code/test/libdrm-2.4.89# touch readme.txt
root@ubuntu:/home/run/code/test/libdrm-2.4.89# git status
On branch master
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: README
Untracked files:
(use "git add <file>..." to include in what will be committed)
readme.txt
no changes added to commit (use "git add" and/or "git commit -a")
## 2. git add . ：跟踪所有变化，和 git add -A 相同
root@ubuntu:/home/run/code/test/libdrm-2.4.89# git add .
root@ubuntu:/home/run/code/test/libdrm-2.4.89# git status
On branch master
Changes to be committed:
(use "git reset HEAD <file>..." to unstage)
deleted: README
new file: readme.txt
## 3. 回退到步骤1
root@ubuntu:/home/run/code/test/libdrm-2.4.89# git reset HEAD README
Unstaged changes after reset:
D README
root@ubuntu:/home/run/code/test/libdrm-2.4.89# git reset HEAD readme.txt
Unstaged changes after reset:
D README
root@ubuntu:/home/run/code/test/libdrm-2.4.89# git status
On branch master
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: README
Untracked files:
(use "git add <file>..." to include in what will be committed)
readme.txt
no changes added to commit (use "git add" and/or "git commit -a")
## 4. git add -u
root@ubuntu:/home/run/code/test/libdrm-2.4.89# git add -u
root@ubuntu:/home/run/code/test/libdrm-2.4.89# git status
On branch master
Changes to be committed:
(use "git reset HEAD <file>..." to unstage)
deleted: README
Untracked files:
(use "git add <file>..." to include in what will be committed)
readme.txt ## 新增文件没有被跟踪
5、git commit
功能：提交更新。
格式：git commit
用法：
root@ubuntu:/home/run/code/libdrm-2.4.89# git commit -m "Init code"
[master (root-commit) bfa9cc1] Init code
337 files changed, 156347 insertions(+)
create mode 100644 Makefile.am
create mode 100644 Makefile.in
create mode 100644 Makefile.sources
create mode 100644 README
create mode 100644 aclocal.m4
create mode 100644 amdgpu/Makefile.am
注：
1）git commit：启动文本编辑器，输入提交说明。文本编辑器使用git config指定，可参考前一篇文章。
2）git commit -m “...”：在-m后输入提交信息，直接提交。
3）git commit --amend：对上次提交的信息进行修改。
例：
新建本地libdrm-2.4.89 代码git仓方法如下：
root@ubuntu:/home/run/code/libdrm-2.4.89# git init
root@ubuntu:/home/run/code/libdrm-2.4.89# git add .
root@ubuntu:/home/run/code/libdrm-2.4.89# git commit -m "Init code"
6、.gitignore
功能：忽略文件
在git仓目录下编辑.gitignore文件，忽略不需要纳入git仓管理的文件，例：编译后生成的.o等文件。
## 1.新建1.o测试文件，git status查看文件状态
root@ubuntu:/home/run/code/libdrm-2.4.89# touch 1.o
root@ubuntu:/home/run/code/libdrm-2.4.89# git status
On branch master
Changes to be committed:
(use "git reset HEAD <file>..." to unstage)
deleted: README
new file: readme.txt
Untracked files:
(use "git add <file>..." to include in what will be committed)
1.o
## 2.编辑.gitignore
root@ubuntu:/home/run/code/libdrm-2.4.89# vi .gitignore
root@ubuntu:/home/run/code/test/libdrm-2.4.89# cat .gitignore
*.o
## 3.查看文件状态时，没有1.o文件
root@ubuntu:/home/run/code/libdrm-2.4.89# git status
On branch master
Changes to be committed:
(use "git reset HEAD <file>..." to unstage)
deleted: README
new file: readme.txt
Untracked files:
(use "git add <file>..." to include in what will be committed)
.gitignore
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