trap_sig.sh

#!/bin/bash

# trap signal

stopwatch() {
	now=$(date +%s)sec
	while :
	do
		printf "\r%s" $(TZ=UTC date --date now-$now +%H:%M:%S.%N)
	done

}

trap stopwatch SIGINT SIGTERM
echo "pid is $$"

while :	
do
	sleep 60
done