Simple OOP bash

oop.sh

#!/bin/bash

Object() {
  kind=$1 ; this=$2 ; shift 2

  for arg in "$@"; do
    read ARG_KEY ARG_VALUE <<< $(echo "$arg" | sed -E "s/(\w+)=(.*?)/\1 \2/")
    read FUNC <<< $(echo "$arg" | sed -E "s/fn_(\w+)$/\1/")

    if [[ ! -z "$ARG_KEY" && ! -z "$ARG_VALUE" ]]; then
      export ${this}_$ARG_KEY="$ARG_VALUE"
    elif [[ ! -z "$FUNC" && "$FUNC" != "$this" ]]; then
      export ${kind}_fn_$FUNC=$FUNC
    fi
  done
}

Account() {
  Object account "$@"
  Object account $1 fn_display
  Object account $1 fn_deposit
}


display() {
    this=$1

    name=${this}_name
    balance=${this}_balance

    greeting=$2

    echo "$greeting, ${!name}. Your balance is ${!balance}"
}

deposit() {
    this=$1

    current=${this}_balance
    amount=$2

    export ${this}_balance=$(($current + $amount))
}

Account accountA name=First\ Name balance=100

$account_fn_deposit accountA 50
$account_fn_deposit accountA 50
$account_fn_display accountA Hi