#!/bin/sh

if [ -z "$1" ]; then
  echo "Usage: $0 time"
  exit 1
fi

(
wall "Power off after $1!!!"
echo -e "\a" > /dev/console
sleep $1
ret=$?
echo -e "\a" > /dev/console
if [ $ret -eq 0 ]; then
  /sbin/poweroff
fi
) &