NetPlanStaticConfig.sh

END_CONFIG=/etc/netplan/01-network-card.yaml

generateAndApply() {
    sudo netplan generate
    sudo netplan apply
}

getInternetInfo() {
    local INTERNET_INFO=$( ip r | grep default )
    printf "%s" "$( echo $INTERNET_INFO | cut -f$1 -d' ' )"
}

#static information
NAMESERVERS=("1.1.1.1" "1.0.0.1")
NETWORK_MANAGER="NetworkManager"

# information that varies
IP="$( ip r | grep kernel | cut -f9 -d' ' )"
GATEWAY="$( getInternetInfo 3 )"
DEVICE_NAME="$( getInternetInfo 5 )"
METHOD="$( getInternetInfo 7 )"
PREFIX="$( ip r | grep kernel | cut -f1 -d' ' | cut -f2 -d'/' )"

createStaticYAML() {
   local YAML="network:\n"
    YAML+="    version: 2\n"
    YAML+="    renderer: $NETWORK_MANAGER\n"
    YAML+="    ethernets:\n"
    YAML+="        $DEVICE_NAME:\n"
    YAML+="            dhcp4: no\n"
    YAML+="            addresses: [$IP/$PREFIX]\n"
    YAML+="            gateway4: $GATEWAY\n"
    YAML+="            nameservers:\n"
    YAML+="                addresses: [${NAMESERVERS[0]},${NAMESERVERS[1]}]"
    printf "%s" "$YAML"
}

clearConfigs() {
    [ -f $END_CONFIG ] && sudo rm $END_CONFIG
}

setYAML() {
    sudo echo -e "$(createStaticYAML)" > $END_CONFIG
}

clearConfigs
setYAML
generateAndApply
restartNetwork