Proxmox Update all LXC Containers

#!/bin/bash
    # update all containers
 
    # list of container ids we need to iterate through
    containers=$(pct list | tail -n +2 | cut -f1 -d' ')
 
    function update_container() {
      container=$1
      echo "[Info] Updating $container"
      # to chain commands within one exec we will need to wrap them in bash
      pct exec $container -- bash -c "apt update && apt upgrade -y && apt autoremove -y"
    }
 
    for container in $containers
    do
      status=`pct status $container`
      if [ "$status" == "status: stopped" ]; then
        echo [Info] Starting $container
        pct start $container
        echo [Info] Sleeping 5 seconds
        sleep 5
        update_container $container
        echo [Info] Shutting down $container
        pct shutdown $container &
      elif [ "$status" == "status: running" ]; then
        update_container $container
      fi
    done; wait