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#!/usr/bin/env sh
# estimate sytem boot time
# [debug] enable execution tracing
#set -x
set -e
# raw input data
#date +%s
#sysctl_t0_str=$( sysctl kern.boottime | awk -F= '{print($NF)}' )
#sysctl_t0=$( date -jf "%a %b %d %H:%M:%S %G" "${sysctl_t0_str}" +%s )
# check for saved state
if [ -f /tmp/t0_est.log ] ; then {
t0_est="$( cat /tmp/t0_est.log )"
} else {
t0_est=""
} fi
printf "n t_est t_unc t_up_est t_up_unc t0_est t0_unc\n" | column -t
for N in $(seq 0 10080) ; do
printf "${N} ${t0_est}\n" | column -t
t0_est=$( awk -f ckt0.awk ${t0_est} | tail -n2 )
#awk -f ckt0.awk
#sleep $( awk 'BEGIN {print(sqrt( rand()^2.0 + 1.0 ))}' )
#sleep $( echo $t0_est | awk '{print(sqrt( ((60.0*$4)/(60.0 + $4))^2.0 + rand()^2.0 ))}' )
sleep $( echo $t0_est | awk '{print( sqrt($2^2.0 + $4^2.0 + $6^2.0 + rand()^2.0)%60.0 )}' )
done
printf "${t0_est}\n" | tee /tmp/t0_est.log
# [debug] disable execution tracing
set +x
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