Bash вложенный массив

id_equipment_num='5'
ip="728d25af6e8d:192.168.0.2,
  fb44c11c1f29:192.168.0.3,
    9e276580d749:192.168.0.4"

declare -A wow=(
  [$id_equipment_num]=$ip
  )
IFS=$', \n'
for id_equipment in ${!wow[@]}
  do
    for ip_mac in ${wow[$id_equipment]}
      do
          IFS=: read mac_equipment ip_equipment <<< "$ip_mac"
          echo $id_equipment $mac_equipment $ip_equipment
    done
done

ip_equipment='9e276580d749:192.168.0.4'

read -d "\n" mac_equipment ip_equipment <<< "$(\
    for P in $(seq 1 1 2); do 
        eval cmd='"s,(^.+):(.+$),\\$P,p"'
        sed -nr $cmd <<< "$ip_equipment"
    done)"

echo $mac_equipment $ip_equipment