#! /bin/bash

last_wakeup_str=`grep "Enabling non-boot CPUs ..." /var/log/kern.log | tail -n 1 | egrep -o '^.*..:..:..' | head -1`

[ -z "$last_wakeup_str" ] &&  echo -1 && exit 1
wakeup_unix="$(date --date="$last_wakeup_str" +%s)"
now_unix="$(date +%s)"
delta_s=$(( now_unix - wakeup_unix ))

echo "$delta_s"
exit 0