Add Untrack A File Without Deleting It as a git til.

git/untrack-a-file-without-deleting-it.md

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+# Untrack A File Without Deleting It
+
+Generally when I invoke `git rm <filename>`, I do so with the intention of
+removing a file from the project entirely. `git-rm` does exactly that,
+removing the file both from the index and from the working tree.
+
+If you want to untrack a file (remove it from the index), but still have it
+available locally (in the working tree), then you are going to want to use
+the `--cached` flag.
+
+```bash
+$ git rm --cached <filename>
+```
+
+If you do this, you may also consider adding that file to the `.gitignore`
+file.
+
+[source](http://stackoverflow.com/questions/15027873/untrack-and-stop-tracking-files-in-git)