Ignore files globally in Git
When working with Git, you can ignore files and folders by putting those on a .gitignore file on the project’s root. However, if want to ignore files globally, instead of doing so in a per-project basis, you can create a global ignore file.
If you’re on a Mac, run:
# go to home directory cd ~ # create .gitignore_global file touch .gitignore_global # run git command to assign that file as a global ignore git config --global core.excludesfile ~/.gitignore_global # go edit your global config code .gitignore_global # or nano, or other editor yo prefer
Read more & source
https://stackoverflow.com/questions/7335420/global-git-ignore/22885996#22885996