[git] How do I git rm a file without deleting it from disk?

The command removes the file in my system. I meant it to remove only the file from Git-repository.

How can I remove the file from a Git repository, without removing the file in my system?

I tried experimenting with the answers given. My personal finding came out to be:

git rm -r --cached .

And then

git add .

This seemed to make my working directory nice and clean. You can put your fileName in place of the dot.