Article: Untrack files from .gitignore

Wiki article for issue #367: untrack files previously committed from new .gitignore Rename Ignore-files-committed-to-git-repo.md to Ignore-Files-Committed-To-Git-Repo.md Uses proper markdown Also fixed some typos. closes #570 Fix style
FreeCodeCamp · 8cb3c90cf728b7e22b09a0137cc9139d603232b6 · aaronTHJ committed with Rafase282 Mar 13, 2016 · Mar 13, 2016 · 8cb3c90
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+# Untrack files previously committed from new .gitignore
+To untrack a _single_ file, ie stop tracking the file but not delete it from the system use:
+
+`git rm --cached filename`
+
+To untrack _every_ file in `.gitignore`:
+
+First **commit** any outstanding code changes, and then run:
+
+`git rm -r --cached`
+
+This removes any changed files from the index(staging area), then run:
+
+`git add .`
+
+Commit it:
+
+`git commit -m ".gitignore is now working"`
+
+To undo `git rm --cached filename`, use `git add filename`