Simple script for vlan

vlan.sh

#!/bin/bash


DEFADPATER=eno1
DEFVLAN=300
DEFNET=10.137.1.2

RED='\033[0;31m'
GREEN='\033[0;32m'
INFO='\033[0;36m'
NC='\033[0m' # No Color

# Returns true if iface exists and is up, otherwise false.
function ifup {
  typeset output
  output=$(ip link show "$ADAPTER.$VLAN" up) && [[ -n $output ]]
}

function up(){
  if ! ifup &>/dev/null; then  

    echo -e "${GREEN}"
    echo -e "CREATING VLAN $ADAPTER.$VLAN ... \c"
    echo -e "${NC}\c"

    sudo ip link add link $ADAPTER name $ADAPTER.$VLAN type vlan id $VLAN
    sudo ip addr add $NET/24 dev $ADAPTER.$VLAN
    sudo ip link set dev $ADAPTER.$VLAN up

    echo -e "${GREEN}\c"
    echo -e "[DONE]\c"
    echo -e "${NC}"

    echo -e "${INFO}"
    echo -e "ADD MANUALLY SOME ROUTE IF NEEDED"
    echo -e "sudo ip route add 10.137.0.1 via 10.137.1.254 dev $ADAPTER.$VLAN"
    echo -e "${NC}"
  else
    status
  fi
}

function down(){
  echo -e "${GREEN}"
  echo -e "REMOVING VLAN $ADAPTER.$VLAN ... \c"
  echo -e "${NC}\c"

  sudo ip  link delete $ADAPTER.$VLAN &>/dev/null

  echo -e "${GREEN}\c"
  echo -e "[DONE]"
  echo -e "${NC}"
}


function status (){
  if ifup &>/dev/null; then
    echo -e "${GREEN}"
    echo -e "LINK $ADAPTER.$VLAN UP"
  else
    echo -e "${RED}"
    echo -e "LINK $ADAPTER.$VLAN DOWN"
  fi
  echo -e ""${NC}
}


function usage(){
   echo ""
   echo "Usage: $0 [params] up|down|restart|status"
   echo -e "\tPARAMS:"
   echo -e "\t-v vlan"
   echo -e "\t-d adapter"
   echo -e "\t-n ip"
   echo -e "\t-h "
   exit 1 # Exit script after printing help
}


# --- SETUP ---

while getopts "v:d:n:" opt
do  
  case "$opt" in
    v) VLAN="${OPTARG:-$DEFVLAN}";;
    d) ADAPTER="${OPTARG:-$DEFADPATER}";;
    n) NET="${OPTARG:-$DEFNET}";;
    ?|h) usage;;
  esac 
done  

VLAN=${VLAN:-$DEFVLAN}
ADAPTER=${ADAPTER:-$DEFADPATER}
NET=${NET:-$DEFNET}


OPERATION=${!#}

if [ -z $OPERATION ]; then
  usage
fi

case "$OPERATION" in
  'up')
    up 
    ;;
  'down')
    down
    ;;
  'restart')
    down ; sleep 1 ; up
    ;;
  'status')
    status
    ;;
  *)
    usage
    exit 1
    ;;
esac

exit 0