How to stop tracking a previously tracked file from a git repository?

Question

git

I have a repository on bitbucket. I am working with a repository on two remote linux and win systems and I need to store two different project configuration files.
How can I make my repository forever forget about the settings file (which is different for different platforms) and stop tracking it and pulling it from a remote repository?

Answer 1

Add filename to .gitignore. Further

git rm -r --cached .
git add .
git commit -m "fixed untracked files"