In Unix systems the end of a line is represented with a line feed (LF). In windows a line is represented with a carriage return (CR) and a line feed (LF) thus (CRLF). when you get code from git that was uploaded from a unix system they will only have an LF.
If you are a single developer working on a windows machine, and you don't care that git automatically replaces LFs to CRLFs, you can turn this warning off by typing the following in the git command line
Formatting and Whitespace
Formatting and whitespace issues are some of the more frustrating and
subtle problems that many developers encounter when collaborating,
especially cross-platform. It’s very easy for patches or other
collaborated work to introduce subtle whitespace changes because
editors silently introduce them, and if your files ever touch a
Windows system, their line endings might be replaced. Git has a few
configuration options to help with these issues.
core.autocrlf
If you’re programming on Windows and working with people who are not
(or vice-versa), you’ll probably run into line-ending issues at some
point. This is because Windows uses both a carriage-return character
and a linefeed character for newlines in its files, whereas Mac and
Linux systems use only the linefeed character. This is a subtle but
incredibly annoying fact of cross-platform work; many editors on
Windows silently replace existing LF-style line endings with CRLF, or
insert both line-ending characters when the user hits the enter key.
Git can handle this by auto-converting CRLF line endings into LF when
you add a file to the index, and vice versa when it checks out code
onto your filesystem. You can turn on this functionality with the
core.autocrlf setting. If you’re on a Windows machine, set it to true
– this converts LF endings into CRLF when you check out code:
$ git config --global core.autocrlf true
If you’re on a Linux or Mac system that uses LF line endings, then you
don’t want Git to automatically convert them when you check out files;
however, if a file with CRLF endings accidentally gets introduced,
then you may want Git to fix it. You can tell Git to convert CRLF to
LF on commit but not the other way around by setting core.autocrlf to
input:
$ git config --global core.autocrlf input
This setup should leave you with CRLF endings in Windows checkouts,
but LF endings on Mac and Linux systems and in the repository.
If you’re a Windows programmer doing a Windows-only project, then you
can turn off this functionality, recording the carriage returns in the
repository by setting the config value to false:
$ git config --global core.autocrlf false
