ping_m

#!/bin/bash
set -euo pipefail
IFS=$'\n\t'

INTERVAL=5
HOST=${1:-8.8.8.8}

function resolveAddress(){
	if [[ $1 =~ ^([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})$ ]]; then
		echo "IP address $1"
	else
		echo -n "Checking IP address $1... "
		IP=$(dig +short -4 "$1" A | grep -v "dig:" | grep -v ";;" || true)
		if [ $(echo "${IP}" | grep "." | wc -l) -eq 1 ]; then
			echo ${IP}
		else
			echo "can't resolve IP"
			exit -1
		fi
	fi
}

resolveAddress "$HOST"

while true; do
	COLS=$(echo "scale=1; (`tput cols` - 8) / 7.5" | bc)
	PING=$(ping -c 1 -t $INTERVAL $HOST 2>&1 | grep 'icmp_seq' || true)
	if [ -z "$PING" ]
	then
		TIME=$(echo "$INTERVAL*1000" | bc)
		PRINT_TIME="99999"
	else
		TIME=$(echo $PING | cut -d'=' -f 4 | cut -d' ' -f 1 | cut -d'.' -f 1)
		PRINT_TIME=$TIME
	fi
	printf '%8s %s' "${PRINT_TIME}ms"
	EVAL=$(echo "scale=1;if($PRINT_TIME < 100) 1 else (l($PRINT_TIME) - 4) * $COLS" | bc -l | cut -d. -f 1)
	seq -s "=" $EVAL | sed 's/[0-9]//g'
	sleep $(echo "$INTERVAL - $TIME/1000" | bc -l)
done