修改git文件

修改本地库的文件，体验git版本与版本穿梭

初始化git目录 git init

1.1、创建一个文件，并提交到本地本地库

echo "123" >  hello.txt		# 创建文件
git add hello.txt		# 加入到暂存区
git commit -m "first commit" hello.txt		# 提交到本地库
git relog		# 查看分支

$ echo "123" > hello.txt
Administrator@ecs-2145 MINGW64 /c/git-demo (master)
$ git add hello.txt
warning: LF will be replaced by CRLF in hello.txt.
The file will have its original line endings in your working directory
Administrator@ecs-2145 MINGW64 /c/git-demo (master)
$ git log
fatal: your current branch 'master' does not have any commits yet
Administrator@ecs-2145 MINGW64 /c/git-demo (master)
$ git commit -m "first commit" hello.txt
warning: LF will be replaced by CRLF in hello.txt.
The file will have its original line endings in your working directory
[master (root-commit) 416f86e] first commit
 1 file changed, 1 insertion(+)
 create mode 100644 hello.txt
Administrator@ecs-2145 MINGW64 /c/git-demo (master)
$ git log
commit 416f86eb3f1837f5ba07710ecb371a879e52c881 (HEAD -> master)		# 当前版本
Author: zhangsan 	# 提交人
Date:   Fri Sep 1 10:52:37 2023 +0800		# 提交时间
    first commit			#  提交描述

1.2、修改工作区的文件并将文件提交到本地库

echo "456" >> hello.txt
git add hello.txt	
git commit -m "second commit" hello.txt	
git relog		

$ echo "456" >> hello.txt
Administrator@ecs-2145 MINGW64 /c/git-demo (master)
$ git add hello.txt
warning: LF will be replaced by CRLF in hello.txt.
The file will have its original line endings in your working directory
Administrator@ecs-2145 MINGW64 /c/git-demo (master)
$ git commit -m "second commit" hello.txt
warning: LF will be replaced by CRLF in hello.txt.
The file will have its original line endings in your working directory
[master cfcaa42] second commit
 1 file changed, 1 insertion(+)
Administrator@ecs-2145 MINGW64 /c/git-demo (master)
$ git log
commit cfcaa42d561d3375299763306c56bbd6614e0332 (HEAD -> master)		# 当前版本
Author: zhangsan 
Date:   Fri Sep 1 11:05:10 2023 +0800
    second commit		
commit 416f86eb3f1837f5ba07710ecb371a879e52c881
Author: zhangsan 
Date:   Fri Sep 1 10:52:37 2023 +0800
    first commit

1.3、版本穿梭，将版本回退至指定版本

git log #查看版本详细
git reflog #查看版本简略

git log

$ git  log
commit cfcaa42d561d3375299763306c56bbd6614e0332 (HEAD -> master)	# HEAD 指向即为当前版本
Author: zhangsan 
Date:   Fri Sep 1 11:05:10 2023 +0800

    second commit

commit 416f86eb3f1837f5ba07710ecb371a879e52c881
Author: zhangsan 
Date:   Fri Sep 1 10:52:37 2023 +0800

    first commit

1.3.1、版本切换至 416f86eb3f1837f5ba07710ecb371a879e52c881 这个版本

也可以使用版本前7位

语法：git reset --hard 版本号

也可以使用 git checkout 版本号 来切换版本或者分支

git reset --hard 416f86eb3f1837f5ba07710ecb371a879e52c881 
git log

$ git reset --hard 416f86eb3f1837f5ba07710ecb371a879e52c881
HEAD is now at 416f86e first commit

$ git log
commit 416f86eb3f1837f5ba07710ecb371a879e52c881 (HEAD -> master)		# 当前所处版本
Author: zhangsan 
Date:   Fri Sep 1 10:52:37 2023 +0800

    first commit

1.3.2、查看文件变化

cat hello.txt

$ cat hello.txt
123

可以发现之间写入的456已经没有了，回到了最初的时候

补充：

可以打开.git\refs\heads\master查看版本号