add specific file to gitignore code example

Example 1: gitignroe remove folder

git rm -r --cached some-directory
git commit -m 'Remove the now ignored directory "some-directory"'
git push origin master

Example 2: how to git ignore a file

git config --global core.excludesfile ~/.gitignore_global

Example 3: git ignore not saving changes

git rm -rf --cached .
git add .

Example 4: git ignore content of a folder

# exclude everything
somefolder/*

# exception to the rule
!somefolder/.gitkeep