指定不需要Git管理的文件

$ mkdir doc #创建一个doc文件夹
$ echo 'hi' > doc/ignoret #在doc文件夹下创建一个文件
$ git status #查看状态 提示doc目录未被追踪 需要add
On branch temp
Untracked files:
  (use "git add <file>..." to include in what will be committed)

	doc/
$ vi .gitignore #在工程根目录创建.gitignore文件 写入doc 保存退出
$ git status #查看状态 doc目录不会再被提示未被追踪 说明Git不再管理doc目录
On branch temp
Untracked files:
  (use "git add <file>..." to include in what will be committed)

	.gitignore

$ vi .gitignore #在把doc修改为doc/
$ git status #查看状态 doc目录依然不被Git所管理
On branch temp
Untracked files:
  (use "git add <file>..." to include in what will be committed)

	.gitignore

$ rm -rf doc #删除doc文件夹
$ echo 'This is file.' > doc #创建doc文件
$ cat .gitignore
doc/
$ git status #doc文件还是会被Git管理的
On branch temp
Untracked files:
  (use "git add <file>..." to include in what will be committed)

	.gitignore
	doc

$ vi .gitignore #如果也不想让Git管理doc文件，那么把doc改成doc/就可以了
$ git status
On branch temp
Untracked files:
  (use "git add <file>..." to include in what will be committed)

	.gitignore

$ mv .gitignore doc.gitignore #将.gitignore文件名修改为doc.gitignore
$ git status #查看状态 doc就会重新被Git管理 所以文件名必须要是.gitignore
On branch temp
Untracked files:
  (use "git add <file>..." to include in what will be committed)

	doc
	doc.gitignore