time difference

Time difference

res1=$(date +%s.%N)
sleep 1
res2=$(date +%s.%N)
echo "Start time: $res1"
echo "Stop time:  $res2"
echo "Elapsed:    $(echo "$res2 - $res1"|bc )"

printf "Elapsed:    %.3F\n"  $(echo "$res2 - $res1"|bc )