SHELL

git remove all files from gitignore

git ls-files -i --exclude-from=.gitignore | %{git rm --cached $_}

// works with windows powershell

git remove all files in gitignore

git ls-files -i -z --exclude-from=.gitignore | xargs -0 git rm --cached

remove gitignore files

git ls-files --ignored --exclude-standard -z | xargs -0 git rm --cached
git commit -am "Remove ignored files"


// answer from: thSoft