fabfile.py

            if [ -e /etc/sudoers.tmp -o "$(pidof visudo)" ]; then
                echo $(pidof visudo)
                echo "/etc/sudoers busy, try again later"
                exit 1
            fi

            cp -p /etc/sudoers /etc/sudoers.bak
            cp -p /etc/sudoers /etc/sudoers.tmp

            line="%wheel ALL=(ALL) ALL"

            sed -i "/${line}/ s/# *//" /etc/sudoers.tmp

            mv /etc/sudoers.tmp /etc/sudoers

            exit 0