Simple bash script for upgrading pullio from github

upgrade_pullio.sh

pullio_up () {
    _promptyn () {
        if [[ -z $1 ]]; then
            echo "_promptyn misses text"
        else
            while true; do
                read -rp "$1 " yn
                case "${yn:-$2}" in
                    [Yy]* ) return 0;;
                    [Nn]* ) return 1;;
                    * ) echo "Please answer yes or no.";;
                esac
            done
        fi
    }
    if [[ ! $(type -P pullio) ]]; then
        if _promptyn "pullio is not installed. Do you want to install? [Yn] " y; then
            sudo curl -fsSL "https://raw.githubusercontent.com/hotio/pullio/master/pullio.sh" -o /usr/local/bin/pullio
            sudo chmod +x /usr/local/bin/pullio
        fi
        exit 0
    fi
    sudo curl -fsSL "https://raw.githubusercontent.com/hotio/pullio/master/pullio.sh" -o /tmp/pullio_tmp
    CUR_VER=$(grep -i current_version= /usr/local/bin/pullio | awk -F "=" '{ print $2 }')
    NEW_VER=$(grep -i current_version= /tmp/pullio_tmp | awk -F "=" '{ print $2 }')
    if [ "$CUR_VER" != "$NEW_VER" ]; then
        echo Found new version of pullio: $NEW_VER vs $CUR_VER
        if _promptyn "Do you want to upgrade? [Yn] " y; then
            sudo curl -fsSL "https://raw.githubusercontent.com/hotio/pullio/master/pullio.sh" -o /usr/local/bin/pullio
            sudo chmod +x /usr/local/bin/pullio
        else
            echo Not upgrading
        fi
    else
        echo You are running the newest version of pullio \("$CUR_VER"\)
    fi
}