declare -A osInfo;
osInfo[/etc/redhat-release]=yum
osInfo[/etc/arch-release]=pacman
osInfo[/etc/gentoo-release]=emerge
osInfo[/etc/SuSE-release]=zypp
osInfo[/etc/debian_version]=apt-get
osInfo[/etc/alpine-release]=apk

for key val in "${(@kv)osInfo}"; do
    if [[ -f $key ]];then
        PACKAGE_MANAGER=$val
    fi
done

install_package() {
if [ "$PACKAGE_MANAGER" == "yum" ]; then yum install -y $1
elif [ "$PACKAGE_MANAGER" == "pacman" ]; then pacman -S --noconfirm $1
elif [ "$PACKAGE_MANAGER" == "emerge" ]; then emerge $1
elif [ "$PACKAGE_MANAGER" == "zypp" ]; then zypper install $1
elif [ "$PACKAGE_MANAGER" == "apt-get" ]; then apt-get install -y $1
elif [ "$PACKAGE_MANAGER" == "apk" ]; then apk add $1; fi
}