6 版本管理

修改之前提交的 new 1.txt 文件，改为：

Git is a distributed version control system.
Git is free software.

此时，可以通过运行 git status 命令来查看仓库的当前状态

$ git status
On branch master
Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git restore <file>..." to discard changes in working directory)
        modified:   new 1.txt

no changes added to commit (use "git add" and/or "git commit -a")

输出显示文件 new 1.txt 已经被修改过了，但是还没有提交。

如果想查看文件被修改的内容，可以通过命令 git diff 来查看：

$ git diff
diff --git a/new 1.txt b/new 1.txt
index d8036c1..013b5bc 100644
--- a/new 1.txt
+++ b/new 1.txt
@@ -1,2 +1,2 @@
-Git is a version control system.
+Git is a distributed version control system.
 Git is free software.
\ No newline at end of file

通过输出可以看到 new 1.txt 文件的第一行被修改，也可以看到具体修改内容的前后对比

提交修改和提交新文件的步骤相同

第一步 git add

$ git add new\ 1.txt

此时再查看仓库状态

$ git status
On branch master
Changes to be committed:
  (use "git restore --staged <file>..." to unstage)
        modified:   new 1.txt

输出显示，将要被提交的修改包括 readme.txt

第二步 git commit

$ git commit -m "Second TXT file"
[master ce29c7e] Second TXT file
 1 file changed, 1 insertion(+), 1 deletion(-)

提交后，再次查看仓库状态：

$ git status
On branch master
nothing to commit, working tree clean

输出显示当前没有需要提交的修改，工作目录是干净的。