~/.git-credentials

The following shell command try to demonstrate how a Personal Access Token for GitHub can be stored in Linux:

githubToken='ghp_…'
git config --global credential.helper store
echo "https://ReneNyffenegger:$githubToken@github.com" > ~/.git-credentials

It's possible in Windows to store the credentials (that is: the User Access Token (UAT)) for GitHub with something like

C:\> cmdkey /generic:git:https://github.com /user:ReneNyffenegger /pass:ghp_XXXX…