git user configuration override

In case if it's required to have a different user configuration from the one stored in .gitconfig, there is two possible ways to achieve this:

Local (per git)

$ cd git-repo
$ git config user.name "Name Surname"
$ git config user.email "name.surname@domain.com"

Global

This method will override default or git's user configuration. Add following to .bashrc:

function gitswitch () {
    case "$1" in
    "custom")
        export GIT_AUTHOR_EMAIL="name.surname@domain.com"
        export GIT_AUTHOR_NAME="Name Surname"
        export GIT_COMMITTER_EMAIL="name.surname@domain.com"
        export GIT_COMMITTER_NAME="Name Surname"
        echo "Using custom configuration."
        ;;
    "default")
        unset GIT_AUTHOR_EMAIL
        unset GIT_AUTHOR_NAME
        unset GIT_COMMITTER_EMAIL
        unset GIT_COMMITTER_NAME
        echo "Using default configuration from .gitconfig."
        ;;
    *)
        echo "Bad argument - please specify 'custom' or 'default'."
        ;;
    esac
}

And then:

$ gitswitch custom
Using custom configuration.
$ gitswitch default
Using default configuration from .gitconfig.
$ gitswitch ?
Bad argument - please specify 'custom' or 'default'.