,

force end of line using LF

For repos (Git repositories) that were checked out after those global settings were set, everything will be checked out as whatever it is in the repo -- hopefully LF (\n).
Any CRLF will be converted to just LF on check-in (commit).

With an existing repo that you have already checked out -- that has the correct line endings in the repo but not your working copy -- you can run the following commands to fix it:

git config --global core.eol lf
git config --global core.autocrlf input
git rm -rf --cached .
git reset --hard HEAD

git rm -rf --cached . will delete (rm) recursively (-r) without prompt (-f), all files except those that you have edited (--cached), from the current directory (.). The reset then returns all those files to a state where they have their true line endings (matching what's in the repo).

If you need to fix the line endings of files in a repo, I recommend grabbing an editor that will let you do that in bulk like IntelliJ or Sublime Text, but I'm sure any good one will likely support this.

Put a .gitattributes file in the root of your git repository having following contents:

* text=auto eol=lf

Commit the .gitattributes

Optional tweaks for all IDE

You can also add an .editorconfig in the root of your repository to ensure that modern tooling creates new files with the desired line endings.

# EditorConfig is awesome: http://EditorConfig.org

# top-most EditorConfig file
root = true

# Unix-style newlines with a newline ending every file
[*]
end_of_line = lf
insert_final_newline = true