Script to get latency for 3 AWS US regions

awsping.sh

#!/bin/bash

# usage: ./awsping.sh | sort -n                                                                                       2.7
# 39.93 us-east-2
# 44.95 us-east-1
# 64.89 us-west-2

function region_latency() {
  local region="$1"
  ping -c 1 ec2.$region.amazonaws.com &>/dev/null # throw away the first ping because DNS
  local total=$(ping -c 2 ec2.$region.amazonaws.com | grep "time=" | sed -E 's/.*time=([0-9\.]+).*/\1/' | paste -sd+ - | bc)
  bc <<< "scale=2; $total / 2"
}

latency=$(region_latency us-east-1)
echo "$latency us-east-1"

latency=$(region_latency us-east-2)
echo "$latency us-east-2"

latency=$(region_latency us-west-2)
echo "$latency us-west-2"