bash timer script

bash timer

#!/bin/sh

# Section to timed between START an FINISH...

START=$SECONDS

echo "sleep 30s"
sleep 30s

FINISH=$SECONDS

timer () 
{
hrs="$((($FINISH - $START)/3600))hrs"
min="$(((($FINISH - $START)/60)%60))min"
sec="$((($FINISH - $START)%60))sec"

if [[ $(($FINISH - $START)) -gt 3600 ]]; then echo "$hrs, $min, $sec"
elif [[ $(($FINISH - $START)) -gt 60 ]]; then echo "$min, $sec"
else echo "$sec"
fi
}

echo -n "Elapsed time: "; timer