Git-第二篇廖雪峰Git教程学习笔记（1）基本命令，版本回退

Git-第二篇廖雪峰Git教程学习笔记（1）基本命令，版本回退

1、安装Git-2.16.2-64-bit.exe后，设置用户名，用户邮箱

#--global参数，表示你这台机器上所有的Git仓库都会使用这个配置，当然也可以对某个仓库指定不同的用户名和Email地址。


$ git config --global user.name "Your Name"

$ git config --global user.email "[email protected]"

2、创建版本库

命令：git init

版本库：版本库又名仓库，英文名repository，你可以简单理解成一个目录，这个目录里面的所有文件都可以被Git管理起来，每个文件的修改、删除，Git都能跟踪，以便任何时刻都可以追踪历史，或者在将来某个时刻可以“还原”。

3、把文件添加到版本库

命令：git add 文件

解析：将文件添加到暂存区

命令：git commit -m "log description"

解析：将文件添加到本地库。

-m命令用于添加提交说明日志。

命令：git status

解析：查看当前的文件修改状态。

上面截图因为我们已经提交到本地仓库了，所以当前库中没有任何修改。

命令：git diff 文件

解析：查看指定文件差异。

lfy@lfy-PC MINGW64 /c/fyliu/lfyTemp/gitLocalRepository/yangjie (master)

$ 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")

lfy@lfy-PC MINGW64 /c/fyliu/lfyTemp/gitLocalRepository/yangjie (master)

$ git diff readme.txt

warning: LF will be replaced by CRLF in readme.txt.

The file will have its original line endings in your working directory.

diff --git a/readme.txt b/readme.txt

index 9c69c9c..4b1c78e

--- a/readme.txt

+++ b/readme.txt

@@ -, +, @@

-GIt is a version control system.

+GIt is a distributed version control system.

 Git is free software.

lfy@lfy-PC MINGW64 /c/fyliu/lfyTemp/gitLocalRepository/yangjie (master)

$

4、版本回退

命令：git log [--pretty=oneline]

解析：显示从最近到最远的提交日志

lfy@lfy-PC MINGW64 /c/fyliu/lfyTemp/gitLocalRepository/yangjie (master)

$ git log

commit adde96d057448c792343465df3aee108764defbd (HEAD -> master)

Author: lfy <@qq.com>

Date:   Sat Aug  ::  +

    add GPL

commit 31728b8d6ec5a40ed7eca72aca63533d8625b423

Author: lfy <@qq.com>

Date:   Sat Aug  ::  +

    add distributed

commit 586474b5bd16e377df3b657ffc1b35f663a69038

Author: lfy <@qq.com>

Date:   Sat Aug  ::  +

    create readme.txt

在Git中，用HEAD表示当前版本，上一个版本就是HEAD^，上上一个版本就是HEAD^^，当然往上100个版本写100个^比较容易数不过来，所以写成HEAD~100。





  现在，我们要把当前版本append GPL回退到上一个版本add distributed，就可以使用git reset命令

命令：git reset --hard commit_id

解析：

lfy@lfy-PC MINGW64 /c/fyliu/lfyTemp/gitLocalRepository/yangjie (master)

$ git reset --hard HEAD^

HEAD is now at 31728b8 add distributed

再次查看log，发现我们最后一次提交的内容已经找不到了。

但是，只要当前窗口没有关闭（或者关闭了但你要记得commit id），还是可以再找回的，要输入之前查看的commit id。

（即adde96d057...）

lfy@lfy-PC MINGW64 /c/fyliu/lfyTemp/gitLocalRepository/yangjie (master)

$ git log

commit 31728b8d6ec5a40ed7eca72aca63533d8625b423 (HEAD -> master)

Author: lfy <@qq.com>

Date:   Sat Aug  ::  +

    add distributed

commit 586474b5bd16e377df3b657ffc1b35f663a69038

Author: lfy <@qq.com>

Date:   Sat Aug  ::  +

    create readme.txt

lfy@lfy-PC MINGW64 /c/fyliu/lfyTemp/gitLocalRepository/yangjie (master)

$ git reset --hard adde96

HEAD is now at adde96d add GPL

lfy@lfy-PC MINGW64 /c/fyliu/lfyTemp/gitLocalRepository/yangjie (master)

$ cat readme.txt

GIt is a distributed version control system.

Git is free software distributed under the GPL.

lfy@lfy-PC MINGW64 /c/fyliu/lfyTemp/gitLocalRepository/yangjie (master)

$ git log

commit adde96d057448c792343465df3aee108764defbd (HEAD -> master)

Author: lfy <[email protected]>

Date:   Sat Aug 24 21:08:03 2019 +0800

    add GPL

commit 31728b8d6ec5a40ed7eca72aca63533d8625b423

Author: lfy <@qq.com>

Date:   Sat Aug  ::  +

    add distributed

commit 586474b5bd16e377df3b657ffc1b35f663a69038

Author: lfy <@qq.com>

Date:   Sat Aug  ::  +

    create readme.txt

lfy@lfy-PC MINGW64 /c/fyliu/lfyTemp/gitLocalRepository/yangjie (master)

$

命令：git reflog

解析：记录你的命令

lfy@lfy-PC MINGW64 /c/fyliu/lfyTemp/gitLocalRepository/yangjie (master)

$ git reflog

adde96d (HEAD -> master) HEAD@{}: reset: moving to adde96

31728b8 HEAD@{}: reset: moving to HEAD^

adde96d (HEAD -> master) HEAD@{}: commit: add GPL

31728b8 HEAD@{}: commit: add distributed

586474b HEAD@{}: commit (initial): create readme.txt

lfy@lfy-PC MINGW64 /c/fyliu/lfyTemp/gitLocalRepository/yangjie (master)

$