目录：

1. 什么是CRLF和LF
2. 为什么要探究CRLF和LF
3. 三种方式处理的不同
4. 更多
5. 参考文献

1、什么是CRLF和LF

CRLF 是 carriage return line feed的缩写。中文意思是回车换行。

LF是line feed的缩写，中文意思是换行。

2、为什么要探究CRLF和LF

在学习git软件，安装git到configuring the lien ending conversion时，有三个选项。

a. Checkout Windows-style,commit Unix-style line endings.

b.Checkout as-is,commit Unix-style line endings.

c.Checkout as-is,commit as-is line endings.

这里面讲到了做两个操作(Checkout,Commit)的三种处理line endings的操作(Windows-style,Unix-style,As-is)。

为什么会出现这三种处理line endings（行尾结束符）呢？在Git的帮助页面给出了很好的解释。

Reference From:https://help.github.com/articles/dealing-with-line-endings

Every time you press return on your keyboard you're actuallyinserting an invisible character called a line ending. Historically, differentoperating systems have handled line endings differently.

When you view changes in a file, Git handles line endings in its own way.Since you're collaborating on projects with Git and GitHub, Git mightproduce unexpected results if, for example, you're working on a Windows machine,and your collaborator has made a change in OS X.

意思很好理解，就不翻译了。重视由于历史的原因，各种不同的操作系统在处理行尾结束符采取了不同的处理方法。而Git和GitHub

3、三种方式处理的不同

CRLF->Windows-style

LF->Unix Style

CR->Mac Style

CRLF表示句尾使用回车换行两个字符(即我们常在Windows编程时使用"\r\n"换行)

LF表示表示句尾，只使用换行.

CR表示只使用回车.

4、在Git中如何转换？

在Git通过下面的命令配置

$git config --global core.autocrlf true
# Configure Git on Windows to properly handle line endings

解释：core.autocrlf是git中负责处理line endings的变量，可以设置三个值--true,inout,false.

设置成三个值会有什么效果呢？

If core.autocrlf is set to true, that means that any time you add a file to the git repo that git thinks is a text file, it will turn all CRLF line endings to just LF before it stores it in the commit.。

设置为true，添加文件到git仓库时，git将其视为文本文件。他将把crlf变成lf。【2】

If core.autocrlf is set to false, no line-ending conversion is ever performed, so text files are checked in as-is. This usually works ok。【2】

设置为false时，line-endings将不做转换操作。文本文件保持原来的样子。

设置为input时，添加文件git仓库石，git把crlf编程lf。当有人Check代码时还是lf方式。因此在window操作系统下，不要使用这个设置。

这是参考文献2给的解释希望能帮助大家。

Yet another way to show how autocrlf works

  1) true:             x -> LF -> CRLF
2) input:            x -> LF -> LF
3) false:            x -> x -> x

where x is either CRLF (windows-style) or LF (unix-style) and arrows stand for

  file to commit -> repository -> checked out file

更多:

更为复杂的配置命令见网站：https://www.kernel.org/pub/software/scm/git/docs/git-config.html

关于LF和CRLF讨论见：http://stackoverflow.com/questions/1967370/git-replacing-lf-with-crlf

You can also provide a special --global flag, which makes Git usethe same settings for line endings across every local Git repository on your computer.

参考文献

【1】https://help.github.com/articles/dealing-with-line-endings

【2】http://stackoverflow.com/questions/1967370/git-replacing-lf-with-crlf