#!/bin/bash

# Precondition: `export PROMPT_COMMAND="history -a"` in .bashrc for ubuntu user

set -eux

COMMAND_TIME=$(date -Is -r /home/ubuntu/.bash_history)
NOW=$(date -Is)

if [[ $(date -d "$NOW" +%s) -lt $(date -d "$COMMAND_TIME +60 minutes" +%s) ]]; then
  echo "Less then 60 minutes after .bash_history. Keep power-on."
  exit 0
fi

echo "60+ min after .bash_history. Shutdown after 10 seconds!"
sleep 10
echo "Shutdown NOW!"
shutdown -h now