Command to remove a git configuration.

remove-git-config.sh

# Remove repository configuration
git config --unset [key]
# Remove global configuration
git config --global --unset [key]
# Remove system configuration
git config --system --unset [key]

What the heck does [key] mean?

@Franks-Joseph [key] here refers to the property you are trying to unset (or remove). For example, if you want to unset/remove the 'username' property, then the [key] will be 'user.name'. So that the command becomes: git config --global --unset user.name

As a little sidenote, in case you have multiple entries with the same key and want to remove them all, you should use unset-all instead of unset.

@Franks-Joseph, to see the keys, run git config --global --list or --local - for local settings respectively. It will be entries such as core.autocrlf, merge.tool=bc and other, depending on what you set.