how to deal with line crlf issues in git

.gitattributes

# Set the default behavior, in case people don't have core.autocrlf set.
* text=auto

# Explicitly declare text files you want to always be normalized and converted
# to native line endings on checkout.
*.c text
*.h text

# Declare files that will always have CRLF line endings on checkout.
*.sln text eol=crlf

# Denote all files that are truly binary and should not be modified.
*.png binary
*.jpg binary

assume unchanged.txt

-- based on this answer: http://stackoverflow.com/a/14129301/1147918

git ls-files -m | xargs -i git update-index --assume-unchanged "{}"

fix & rescan

-- instructions: https://help.github.com/articles/dealing-with-line-endings/, based on http://stackoverflow.com/a/1511273/1147918

git config --global core.autocrlf true

git add . -u

git commit -m "Saving files before refreshing line endings"

git rm --cached -r .

git reset --hard

git add .

git commit -m "Normalize all the line endings"